    indexing
    	description: "An editable combo-box that handles bitmaps."
    	legal: "See notice at end of class."
    	status: "See notice at end of class."
    	date: "$Date: 2006-03-22 23:29:03 -0800 (Wed, 22 Mar 2006) $"
    	revision: "$Revision: 57641 $"

    class interface
    	WEL_DROP_DOWN_COMBO_BOX_EX

    create
    	make (a_parent: WEL_WINDOW; a_x, a_y, a_width, a_height, an_id: INTEGER_32)
    			-- Make a combo box.
    			-- (from WEL_COMBO_BOX)
    		require -- from WEL_COMBO_BOX
    			a_parent_not_void: a_parent /= Void
    			a_parent_exists: a_parent.exists
    		ensure -- from WEL_COMBO_BOX
    			parent_set: parent = a_parent
    			exists: exists
    			id_set: id = an_id

    feature -- Access

    	commands: WEL_COMMAND_MANAGER
    			-- Command manager associated to the current window.
    			-- (from WEL_WINDOW)

    	default_processing: BOOLEAN
    			-- (from WEL_RETURN_VALUE)

    	font: WEL_FONT
    			-- Font with which the control is drawing its text.
    			-- (from WEL_CONTROL)
    		require -- from WEL_CONTROL
    			exists: exists
    		ensure -- from WEL_CONTROL
    			result_not_void: Result /= Void

    	generating_type: STRING_8
    			-- Name of current object's generating type
    			-- (type of which it is a direct instance)
    			-- (from ANY)

    	generator: STRING_8
    			-- Name of current object's generating class
    			-- (base class of the type of which it is a direct instance)
    			-- (from ANY)

    	has_return_value: BOOLEAN
    			-- Should the window procedure return a value?
    			-- (from WEL_RETURN_VALUE)

    	i_th_text (i: INTEGER_32): STRING_32
    			-- Text at the zero-based index `i'
    			-- (from WEL_COMBO_BOX)
    		require -- from WEL_COMBO_BOX
    			exists: exists
    			i_large_enough: i >= 0
    			i_small_enough: i < count
    		ensure -- from WEL_COMBO_BOX
    			result_exists: Result /= Void

    	i_th_text_length (i: INTEGER_32): INTEGER_32
    			-- Length text at the zero-based index `i'
    			-- (from WEL_COMBO_BOX)
    		require -- from WEL_COMBO_BOX
    			exists: exists
    			i_large_enough: i >= 0
    			i_small_enough: i < count
    		ensure -- from WEL_COMBO_BOX
    			positive_result: Result >= 0

    	id: INTEGER_32
    			-- Control id
    			-- (from WEL_CONTROL)

    	item: POINTER
    			-- Generic Windows handle or structure pointer.
    			-- Can be a HWND, HICON, RECT *, WNDCLASS *, etc...
    			-- (from WEL_ANY)

    	message_return_value: POINTER
    			-- Return value of the window procedure.
    			-- (from WEL_RETURN_VALUE)
    		require -- from WEL_RETURN_VALUE
    			has_return_value: has_return_value

    	parent: WEL_WINDOW
    			-- Parent window
    			-- (from WEL_WINDOW)

    feature -- Measurement

    	count: INTEGER_32
    			-- Number of lines
    			-- (from WEL_COMBO_BOX)
    		require -- from WEL_COMBO_BOX
    			exists: exists
    		ensure -- from WEL_COMBO_BOX
    			positive_result: Result >= 0

    feature -- Comparison

    	frozen deep_equal (some: ANY; other: like arg #1): BOOLEAN
    			-- Are `some' and `other' either both void
    			-- or attached to isomorphic object structures?
    			-- (from ANY)
    		ensure -- from ANY
    			shallow_implies_deep: standard_equal (some, other) implies Result
    			both_or_none_void: (some = Void) implies (Result = (other = Void))
    			same_type: (Result and (some /= Void)) implies some.same_type (other)
    			symmetric: Result implies deep_equal (other, some)

    	frozen equal (some: ANY; other: like arg #1): BOOLEAN
    			-- Are `some' and `other' either both void or attached
    			-- to objects considered equal?
    			-- (from ANY)
    		ensure -- from ANY
    			definition: Result = (some = Void and other = Void) or else ((some /= Void and other /= Void) and then some.is_equal (other))

    	is_equal (other: like Current): BOOLEAN
    			-- Is `other' attached to an object considered
    			-- equal to current object?
    			-- (from ANY)
    		require -- from ANY
    			other_not_void: other /= Void
    		ensure -- from ANY
    			symmetric: Result implies other.is_equal (Current)
    			consistent: standard_is_equal (other) implies Result

    	frozen standard_equal (some: ANY; other: like arg #1): BOOLEAN
    			-- Are `some' and `other' either both void or attached to
    			-- field-by-field identical objects of the same type?
    			-- Always uses default object comparison criterion.
    			-- (from ANY)
    		ensure -- from ANY
    			definition: Result = (some = Void and other = Void) or else ((some /= Void and other /= Void) and then some.standard_is_equal (other))

    	frozen standard_is_equal (other: like Current): BOOLEAN
    			-- Is `other' attached to an object of the same type
    			-- as current object, and field-by-field identical to it?
    			-- (from ANY)
    		require -- from ANY
    			other_not_void: other /= Void
    		ensure -- from ANY
    			same_type: Result implies same_type (other)
    			symmetric: Result implies other.standard_is_equal (Current)

    feature -- Status report

    	absolute_x: INTEGER_32
    			-- Absolute x position
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    		ensure -- from WEL_WINDOW
    			Result = window_rect.x

    	absolute_y: INTEGER_32
    			-- Absolute y position
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    		ensure -- from WEL_WINDOW
    			Result = window_rect.y

    	background_brush: WEL_BRUSH
    			-- Current window background color used to refresh the window when
    			-- requested by the WM_ERASEBKGND windows message.
    			-- By default there is no background
    			-- (from WEL_WINDOW)
    		ensure -- from WEL_WINDOW
    			new_object: Result /= Void implies Result /= background_brush

    	captured_window: WEL_WINDOW
    			-- Current window which has been captured.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    			window_captured: window_captured

    	client_rect: WEL_RECT
    			-- Client rectangle
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    		ensure -- from WEL_WINDOW
    			result_not_void: Result /= Void

    	command (message: INTEGER_32): WEL_COMMAND
    			-- Command associated to `message'
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			positive_message: message >= 0
    			command_exists: command_exists (message)
    		ensure -- from WEL_WINDOW
    			result_not_void: Result /= Void

    	command_argument (message: INTEGER_32): ANY
    			-- Command argument associated to `message'
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			positive_message: message >= 0
    			command_exists: command_exists (message)

    	command_exists (message: INTEGER_32): BOOLEAN
    			-- Does a command associated to `message' exist?
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			positive_message: message >= 0

    	commands_enabled: BOOLEAN
    			-- Is the commands execution enabled?
    			-- (from WEL_WINDOW)

    	conforms_to (other: ANY): BOOLEAN
    			-- Does type of current object conform to type
    			-- of `other' (as per Eiffel: The Language, chapter 13)?
    			-- (from ANY)
    		require -- from ANY
    			other_not_void: other /= Void

    	dropped_rect: WEL_RECT
    			-- Rectangle of the drop down list box
    			-- (from WEL_COMBO_BOX)
    		require -- from WEL_COMBO_BOX
    			exists: exists
    		ensure -- from WEL_COMBO_BOX
    			result_not_void: Result /= Void

    	enabled: BOOLEAN
    			-- Is the window enabled for mouse and keyboard input?
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	ex_style: INTEGER_32
    			-- Window ex_style
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	exists: BOOLEAN
    			-- Does the item exist?
    			-- (from WEL_ANY)
    		ensure -- from WEL_ANY
    			Result = (item /= default_pointer)

    	focused_window: WEL_WINDOW
    			-- Current window which has the focus.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	get_image_list: WEL_IMAGE_LIST
    			-- Get the image list associated with this combination box.
    			-- Returns Void if none.\
    			-- (from WEL_COMBO_BOX_EX)

    	get_item_info (index: INTEGER_32): WEL_COMBO_BOX_EX_ITEM
    			-- Retrieves the information about the zero-based
    			-- `index' item.
    			-- (from WEL_COMBO_BOX_EX)
    		require -- from WEL_COMBO_BOX_EX
    			exists: exists
    			index_large_enough: index >= 0
    			index_small_enough: index < count

    	get_text_limit: INTEGER_32
    			-- Return the maximum text length.
    			-- (from WEL_COMBO_BOX)

    	has_capture: BOOLEAN
    			-- Does this window have the capture?
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	has_focus: BOOLEAN
    			-- Does this window have the focus?
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	has_heavy_capture: BOOLEAN
    			-- Does this window have the heavy capture?
    			-- (from WEL_WINDOW)

    	has_horizontal_scroll_bar: BOOLEAN
    			-- Does this window have a horizontal scroll bar?
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	has_system_font: BOOLEAN
    			-- Does the control use the system font?
    			-- (from WEL_CONTROL)
    		require -- from WEL_CONTROL
    			exists: exists

    	has_vertical_scroll_bar: BOOLEAN
    			-- Does this window have a vertical scroll bar?
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	heavy_capture_activated: BOOLEAN
    			-- Is the heavy capture currently running?
    			-- (i.e. is there a window in the current program
    			-- with has_heavy_capture to True?)
    			-- (from WEL_WINDOW)

    	height: INTEGER_32
    			-- Window height
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	is_inside: BOOLEAN
    			-- Is the current window inside another window?
    			-- (from WEL_WINDOW)

    	list_item_height: INTEGER_32
    			-- height of list items in a combo box
    			-- (from WEL_COMBO_BOX)
    		ensure -- from WEL_COMBO_BOX
    			operation_successful: Result /= cb_err

    	list_shown: BOOLEAN
    			-- Is the drop down list shown?
    			-- (from WEL_COMBO_BOX_EX)
    		require -- from WEL_COMBO_BOX_EX
    			exists: exists

    	maximal_height: INTEGER_32
    			-- Maximal height allowed for the window
    			-- (from WEL_WINDOW)
    		ensure -- from WEL_WINDOW
    			result_large_enough: Result >= minimal_height

    	maximal_width: INTEGER_32
    			-- Maximal width allowed for the window
    			-- (from WEL_WINDOW)
    		ensure -- from WEL_WINDOW
    			result_large_enough: Result >= minimal_width

    	maximized: BOOLEAN
    			-- Is the window maximized?
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	minimal_height: INTEGER_32
    			-- Minimal height allowed for the window
    			-- Zero by default.
    			-- (from WEL_WINDOW)
    		ensure -- from WEL_WINDOW
    			positive_result: Result >= 0
    			result_small_enough: Result <= maximal_height

    	minimal_width: INTEGER_32
    			-- Minimal width allowed for the window
    			-- Zero by default.
    			-- (from WEL_WINDOW)
    		ensure -- from WEL_WINDOW
    			positive_result: Result >= 0
    			result_small_enough: Result <= maximal_width

    	minimized: BOOLEAN
    			-- Is the window minimized?
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	placement: WEL_WINDOW_PLACEMENT
    			-- Window placement information
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    		ensure -- from WEL_WINDOW
    			result_not_void: Result /= Void

    	same_type (other: ANY): BOOLEAN
    			-- Is type of current object identical to type of `other'?
    			-- (from ANY)
    		require -- from ANY
    			other_not_void: other /= Void
    		ensure -- from ANY
    			definition: Result = (conforms_to (other) and other.conforms_to (Current))

    	selected: BOOLEAN
    			-- Is an item selected?
    			-- (from WEL_COMBO_BOX)
    		require -- from WEL_COMBO_BOX
    			exists: exists

    	selected_item: INTEGER_32
    			-- Zero-based index of the selected item
    			-- (from WEL_COMBO_BOX)
    		require -- from WEL_COMBO_BOX
    			exists: exists
    			selected: selected
    		ensure -- from WEL_COMBO_BOX
    			result_large_enough: Result >= 0
    			result_small_enough: Result < count

    	selected_string: STRING_32
    			-- String currently selected
    			-- (from WEL_COMBO_BOX)
    		require -- from WEL_COMBO_BOX
    			exists: exists
    			selected: selected
    		ensure -- from WEL_COMBO_BOX
    			result_not_void: Result /= Void

    	selection_field_height: INTEGER_32
    			-- height of the selection field in a combo box
    			-- (from WEL_COMBO_BOX)
    		ensure -- from WEL_COMBO_BOX
    			operation_successful: Result /= cb_err

    	shared: BOOLEAN
    			-- Is item shared by another object?
    			-- If False (by default), item will
    			-- be destroyed by destroy_item.
    			-- If True, item will not be destroyed.
    			-- (from WEL_ANY)

    	shown: BOOLEAN
    			-- Is the window shown?
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	style: INTEGER_32
    			-- Window style
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	text: STRING_32
    			-- Window text
    		require -- from WEL_WINDOW
    			exists: exists
    		ensure -- from WEL_WINDOW
    			result_not_void: Result /= Void

    	text_length: INTEGER_32
    			-- Text length
    		require -- from WEL_WINDOW
    			exists: exists
    		ensure -- from WEL_WINDOW
    			positive_result: Result >= 0

    	top_index: INTEGER_32
    			-- Zero-based index of the first visible item in the list
    			-- box portion of a combo box.
    			-- Initially, the item with index 0 is at the top of the
    			-- list box, but if the list box contents have been scrolled,
    			-- another item may be at the top.
    			-- (from WEL_COMBO_BOX)
    		ensure -- from WEL_COMBO_BOX
    			operation_successful: Result /= cb_err

    	width: INTEGER_32
    			-- Window width
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	window_captured: BOOLEAN
    			-- Has a window been captured?
    			-- (from WEL_WINDOW)

    	window_rect: WEL_RECT
    			-- Window rectangle (absolute position)
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    		ensure -- from WEL_WINDOW
    			result_not_void: Result /= Void

    	x: INTEGER_32
    			-- Window x position
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    		ensure -- from WEL_WINDOW
    			parent = Void implies Result = absolute_x

    	y: INTEGER_32
    			-- Window y position
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    		ensure -- from WEL_WINDOW
    			parent = Void implies Result = absolute_y

    feature {ANY} -- Status report

    	valid_hwnd_constant (c: POINTER): BOOLEAN
    			-- Is `c' a valid hwnd constant?
    			-- (from WEL_HWND_CONSTANTS)

    feature -- Status setting

    	disable
    			-- Disable mouse and keyboard input
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    		ensure -- from WEL_WINDOW
    			disabled: not enabled

    	disable_commands
    			-- Disable commands execution.
    			-- (from WEL_WINDOW)
    		ensure -- from WEL_WINDOW
    			commands_disabled: not commands_enabled

    	disable_default_processing
    			-- Disable default window processing.
    			-- The standard window procedure will not be called for
    			-- each messages received by the window and then the
    			-- normal behavior will not occur.
    			-- (from WEL_WINDOW)
    		ensure -- from WEL_WINDOW
    			default_processing_disabled: not default_processing

    	disable_drag_accept_files
    			-- Disallow `Current' from being a file drag and drop target.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists

    	enable
    			-- Enable mouse and keyboard input.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    		ensure -- from WEL_WINDOW
    			enabled: enabled

    	enable_commands
    			-- Enable commands execution.
    			-- (from WEL_WINDOW)
    		ensure -- from WEL_WINDOW
    			commands_enabled: commands_enabled

    	enable_default_processing
    			-- Enable default window processing.
    			-- The standard window procedure will be called for
    			-- each messages received by the window and then the
    			-- normal behavior will occur.
    			-- (from WEL_WINDOW)
    		ensure -- from WEL_WINDOW
    			default_processing_enabled: default_processing

    	enable_drag_accept_files
    			-- Allow `Current' to be a file drag and drop target.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists

    	hide
    			-- Hide the window
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    		ensure -- from WEL_WINDOW
    			hidden: not shown

    	hide_list
    			-- Hide the drop down list.
    			-- (from WEL_COMBO_BOX_EX)
    		require -- from WEL_COMBO_BOX_EX
    			exists: exists
    		ensure -- from WEL_COMBO_BOX_EX
    			list_not_shown: not list_shown

    	maximize
    			-- Maximize the window
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    		ensure -- from WEL_WINDOW
    			maximized: maximized

    	minimize
    			-- Minimize the window and display its icon
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    		ensure -- from WEL_WINDOW
    			minimized: minimized

    	release_capture
    			-- Release the mouse capture after a call
    			-- to set_capture.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    			has_capture: has_capture
    		ensure -- from WEL_WINDOW
    			not_has_capture: not has_capture

    	release_heavy_capture
    			-- Release the mouse capture after a call
    			-- to set_heavy_capture.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    			has_heavy_capture: has_heavy_capture
    			heavy_capture_activated: heavy_capture_activated
    		ensure -- from WEL_WINDOW
    			heavy_capture_set: not has_heavy_capture
    			heavy_capture_deactivated: not heavy_capture_activated

    	restore
    			-- Restore the window to its
    			-- original size and position after
    			-- minimize or maximize
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	select_item (index: INTEGER_32)
    			-- Select item at the zero-based `index'.
    			-- (from WEL_COMBO_BOX)
    		require -- from WEL_COMBO_BOX
    			exists: exists
    			index_large_enough: index >= 0
    			index_small_enough: index < count
    		ensure -- from WEL_COMBO_BOX
    			selected_item: selected and then selected_item = index

    	set_capture
    			-- Set the mouse capture to the `Current' window.
    			-- Once the window has captured the mouse, all
    			-- mouse input is directed to this window, regardless
    			-- of whether the cursor is over that window. Only
    			-- one window can have the mouse capture at a time.
    			--
    			-- Works only for windows in the same thread as your
    			-- application.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    			has_not_capture: not has_capture
    			has_not_heavy_capture: not has_heavy_capture
    		ensure -- from WEL_WINDOW
    			has_capture: has_capture

    	set_ex_style (an_ex_style: INTEGER_32)
    			-- Set `an_ex_style' with ex_style.
    			--
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	set_focus
    			-- Set the focus to `Current'
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	set_heavy_capture
    			-- Set the mouse capture to the `Current' window.
    			-- Once the window has captured the mouse, all
    			-- mouse input is directed to this window, regardless
    			-- of whether the cursor is over that window. Only
    			-- one window can have the mouse capture at a time.
    			--
    			-- Works for ALL windows.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    			has_not_heavy_capture: not has_heavy_capture
    			heavy_capture_deactivated: not heavy_capture_activated
    		ensure -- from WEL_WINDOW
    			heavy_capture_set: has_heavy_capture implies heavy_capture_activated

    	set_image_list (an_imagelist: WEL_IMAGE_LIST)
    			-- Set the current image list to `an_imagelist'.
    			-- If `an_imagelist' is set to Void, it removes
    			-- the current associated image list (if any).
    			-- (from WEL_COMBO_BOX_EX)

    	set_item_info (index: INTEGER_32; an_item: WEL_COMBO_BOX_EX_ITEM)
    			-- Sets the information about the zero-based
    			-- `index' item.
    			-- (from WEL_COMBO_BOX_EX)
    		require -- from WEL_COMBO_BOX_EX
    			exists: exists
    			index_large_enough: index >= 0
    			index_small_enough: index < count
    		ensure -- from WEL_COMBO_BOX_EX
    			an_item_updated: an_item.index = index

    	set_shared
    			-- Set shared to True.
    			-- (from WEL_ANY)
    		ensure -- from WEL_ANY
    			shared: shared

    	set_style (a_style: INTEGER_32)
    			-- Set style with `a_style'.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	set_unshared
    			-- Set shared to False.
    			-- (from WEL_ANY)
    		ensure -- from WEL_ANY
    			unshared: not shared

    	show
    			-- Show the window
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	show_list
    			-- Show the drop down list.
    			-- (from WEL_COMBO_BOX_EX)
    		require -- from WEL_COMBO_BOX_EX
    			exists: exists
    		ensure -- from WEL_COMBO_BOX_EX
    			list_shown: list_shown

    	unselect
    			-- Clear the selection.
    			-- (from WEL_COMBO_BOX)
    		require -- from WEL_COMBO_BOX
    			exists: exists
    		ensure -- from WEL_COMBO_BOX
    			selection_cleared: not selected

    	update_cached_style (new_ex_style, old_ex_style: INTEGER_32)
    			-- Update Window cache buffer for Window style.
    			-- (from WEL_WINDOW)

    feature -- Element change

    	add_string (a_string: STRING_GENERAL)
    			-- Add `a_string' in the combo box.
    			-- (from WEL_COMBO_BOX_EX)
    		require -- from WEL_COMBO_BOX
    			exists: exists
    			a_string_not_void: a_string /= Void
    		ensure -- from WEL_COMBO_BOX
    			new_count: count = old count + 1

    	delete_item (index: INTEGER_32)
    			-- Delete the zero-based `index' item.
    			-- (from WEL_COMBO_BOX_EX)
    		require -- from WEL_COMBO_BOX_EX
    			exists: exists
    			index_large_enough: index >= 0
    			index_small_enough: index < count
    		ensure -- from WEL_COMBO_BOX_EX
    			new_count: count = old count - 1

    	delete_string (index: INTEGER_32)
    			-- Delete the item at the zero-based `index'.
    			-- (from WEL_COMBO_BOX)
    		require -- from WEL_COMBO_BOX
    			exists: exists
    			index_large_enough: index >= 0
    			index_small_enough: index < count
    		ensure -- from WEL_COMBO_BOX
    			new_count: count = old count - 1

    	disable_redraw
    			-- Disable redrawing of `Current' until next call to enable_redraw.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	enable_redraw
    			-- Ensure `Current' is redrawn as required.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	has_system_window_locked: BOOLEAN
    			-- Is there any window locked ?
    			-- (from WEL_WINDOW)

    	insert_item (an_item: WEL_COMBO_BOX_EX_ITEM)
    			-- Insert `an_item' in the combo-box.
    			-- (from WEL_COMBO_BOX_EX)
    		require -- from WEL_COMBO_BOX_EX
    			exists: exists
    			an_item_not_void: an_item /= Void
    			an_item_exists: an_item.exists
    			index_large_enough: an_item.index >= 0
    			index_small_enough: an_item.index <= count
    		ensure -- from WEL_COMBO_BOX_EX
    			new_count: count = old count + 1

    	insert_string_at (a_string: STRING_GENERAL; index: INTEGER_32)
    			-- Add `a_string' at the zero-based `index'.
    			-- (from WEL_COMBO_BOX_EX)
    		require -- from WEL_COMBO_BOX
    			exists: exists
    			a_string_not_void: a_string /= Void
    			index_small_enough: index <= count
    			index_large_enough: index >= 0
    		ensure -- from WEL_COMBO_BOX
    			new_count: count = old count + 1

    	lock_window_update
    			-- Disables drawing in the current window. A locked window cannot be moved.
    			-- Only one window can be locked at a time. To unlock a window locked with
    			-- lock_window_update , call 'unlock_window_update'.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    		ensure -- from WEL_WINDOW
    			has_system_window_locked

    	reset_content
    			-- Reset the content of the list.
    			-- (from WEL_COMBO_BOX)
    		require -- from WEL_COMBO_BOX
    			exists: exists
    		ensure -- from WEL_COMBO_BOX
    			new_count: count = 0

    	set_font (a_font: WEL_FONT)
    			-- Set font with `a_font'.
    			-- (from WEL_CONTROL)
    		require -- from WEL_CONTROL
    			exists: exists
    			a_font_not_void: a_font /= Void
    			a_font_exists: a_font.exists
    		ensure -- from WEL_CONTROL
    			font_set: not has_system_font implies font.item = a_font.item

    	set_height (a_height: INTEGER_32)
    			-- Set height with `a_height'
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	set_item (an_item: POINTER)
    			-- Set item with `an_item'
    			-- (from WEL_ANY)
    		ensure -- from WEL_ANY
    			item_set: item = an_item

    	set_parent (a_parent: WEL_WINDOW)
    			-- Change the parent of the current window.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	set_placement (a_placement: WEL_WINDOW_PLACEMENT)
    			-- Set placement with `a_placement'
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    			a_placement_not_void: a_placement /= Void

    	set_timer (timer_id, time_out: INTEGER_32)
    			-- Set a timer identified by `timer_id' with a
    			-- `time_out' value (in milliseconds).
    			-- See also on_timer, kill_timer.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    			positive_timer_id: timer_id > 0
    			positive_time_out: time_out > 0

    	set_width (a_width: INTEGER_32)
    			-- Set width with `a_width'
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	set_x (a_x: INTEGER_32)
    			-- Set x with `a_x'
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	set_y (a_y: INTEGER_32)
    			-- Set y with `a_y'
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	unlock_window_update
    			-- Unlock a locked window.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    feature -- Removal

    	destroy
    			-- Destroy the window.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    		ensure -- from WEL_WINDOW
    			not_exists: not exists

    feature -- Duplication

    	copy (other: like Current)
    			-- Update current object using fields of object attached
    			-- to `other', so as to yield equal objects.
    			-- (from ANY)
    		require -- from ANY
    			other_not_void: other /= Void
    			type_identity: same_type (other)
    		ensure -- from ANY
    			is_equal: is_equal (other)

    	frozen deep_copy (other: like Current)
    			-- Effect equivalent to that of:
    			--		copy (`other' . deep_twin)
    			-- (from ANY)
    		require -- from ANY
    			other_not_void: other /= Void
    		ensure -- from ANY
    			deep_equal: deep_equal (Current, other)

    	frozen deep_twin: like Current
    			-- New object structure recursively duplicated from Current.
    			-- (from ANY)
    		ensure -- from ANY
    			deep_equal: deep_equal (Current, Result)

    	frozen standard_copy (other: like Current)
    			-- Copy every field of `other' onto corresponding field
    			-- of current object.
    			-- (from ANY)
    		require -- from ANY
    			other_not_void: other /= Void
    			type_identity: same_type (other)
    		ensure -- from ANY
    			is_standard_equal: standard_is_equal (other)

    	frozen standard_twin: like Current
    			-- New object field-by-field identical to `other'.
    			-- Always uses default copying semantics.
    			-- (from ANY)
    		ensure -- from ANY
    			standard_twin_not_void: Result /= Void
    			equal: standard_equal (Result, Current)

    	frozen twin: like Current
    			-- New object equal to `Current'
    			-- twin calls copy; to change copying/twining semantics, redefine copy.
    			-- (from ANY)
    		ensure -- from ANY
    			twin_not_void: Result /= Void
    			is_equal: Result.is_equal (Current)

    feature -- Basic operations

    	bring_to_top
    			-- Bring this window to the top of the Z order.
    			--
    			-- Note:
    			--  * If the window is a top-level window, it is activated.
    			--  * If the window is a child window, the top-level parent window
    			--    associated with the child window is activated.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	frozen default: like Current
    			-- Default value of object's type
    			-- (from ANY)

    	frozen default_pointer: POINTER
    			-- Default value of type `POINTER'
    			-- (Avoid the need to write `p'.default for
    			-- some `p' of type `POINTER'.)
    			-- (from ANY)

    	default_process_notification (notification_code: INTEGER_32)
    			-- Process a `notification_code' which has not been
    			-- processed by process_notification.
    			-- (from WEL_CONTROL)
    		require -- from WEL_CONTROL
    			exists: exists

    	default_rescue
    			-- Process exception for routines with no Rescue clause.
    			-- (Default: do nothing.)
    			-- (from ANY)

    	disable_horizontal_scroll_bar
    			-- Disable the horizontal scroll bar.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	disable_vertical_scroll_bar
    			-- Disable the vertical scroll bar.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	frozen do_nothing
    			-- Execute a null action.
    			-- (from ANY)

    	enable_horizontal_scroll_bar
    			-- Enable the horizontal scroll bar.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	enable_vertical_scroll_bar
    			-- Enable the vertical scroll bar.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	find_string_exact (index: INTEGER_32; a_string: STRING_GENERAL): INTEGER_32
    			-- Find the first string that matches `a_string'.
    			-- `index' specifies the zero-based index of the
    			-- item before the first item to be searched.
    			-- Returns -1 if the search was unsuccessful.
    			-- (from WEL_COMBO_BOX)
    		require -- from WEL_COMBO_BOX
    			exists: exists
    			index_large_enough: index >= 0
    			index_small_enough: index < count
    			a_string_not_void: a_string /= Void

    	go_to_next_group_item (a_parent: WEL_COMPOSITE_WINDOW; after: BOOLEAN)
    			-- Find the previous or following control with the
    			-- Wm_tabstop style in the current group in `a_parent'
    			-- depending on the value of `after'.
    			-- (from WEL_CONTROL)
    		require -- from WEL_CONTROL
    			valid_parent: a_parent /= Void and then a_parent.exists

    	go_to_next_tab_item (a_parent: WEL_COMPOSITE_WINDOW; after: BOOLEAN)
    			-- Find the previous or following control with the
    			-- Wm_tabstop style in `a_parent depending on the
    			-- value of `after'.
    			-- (from WEL_CONTROL)
    		require -- from WEL_CONTROL
    			valid_parent: a_parent /= Void and then a_parent.exists

    	hide_horizontal_scroll_bar
    			-- Hide the horizontal scroll bar.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	hide_scroll_bars
    			-- Hide the horizontal and vertical scroll bars.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	hide_vertical_scroll_bar
    			-- Hide the vertical scroll bar.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	insert_after (a_window: WEL_WINDOW)
    			-- Insert the current window after `a_window'.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    			a_window_not_void: a_window /= Void
    			a_window_not_current: a_window /= Current
    			a_window_exists: a_window.exists

    	invalidate
    			-- Invalide the entire client area of the window. The
    			-- background will be erased before.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	invalidate_rect (rect: WEL_RECT; erase_background: BOOLEAN)
    			-- Invalidate the area `rect' and erase
    			-- the background if `erase_background' is True.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    			rect_not_void: rect /= Void

    	invalidate_region (region: WEL_REGION; erase_background: BOOLEAN)
    			-- Invalidate the area `region' and erase
    			-- the background if `erase_background' is True.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    			region_not_void: region /= Void
    			region_exists: region.exists

    	invalidate_without_background
    			-- Invalidate the entire client area of the window. The
    			-- background will not be erased.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	kill_timer (timer_id: INTEGER_32)
    			-- Kill the timer identified by `timer_id'.
    			-- See also set_timer, on_timer.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    			positive_timer_id: timer_id > 0

    	move (a_x, a_y: INTEGER_32)
    			-- Move the window to `a_x', `a_y'.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	move_and_resize (a_x, a_y, a_width, a_height: INTEGER_32; repaint: BOOLEAN)
    			-- Move the window to `a_x', `a_y' position and
    			-- resize it with `a_width', `a_height'.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	put_command (a_command: WEL_COMMAND; message: INTEGER_32; argument: ANY)
    			-- Put `a_command' associated to `message'.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			a_command_not_void: a_command /= Void
    			positive_message: message >= 0
    		ensure -- from WEL_WINDOW
    			command_added: command (message) = a_command and command_argument (message) = argument

    	remove_command (message: INTEGER_32)
    			-- Remove the command associated to `message'.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			positive_message: message >= 0
    			command_exists: command_exists (message)
    		ensure -- from WEL_WINDOW
    			command_removed: not command_exists (message)

    	resize (a_width, a_height: INTEGER_32)
    			-- Resize the window with `a_width', `a_height'.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	scroll (a_x, a_y: INTEGER_32)
    			-- Scroll the contents of the window's client area.
    			-- `a_x' and `a_y' specify the amount of horizontal
    			-- and vertical scrolling.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	set_class_icon (new_icon: WEL_ICON)
    			-- Replace the current icon for the class which this window
    			-- belongs to.
    			--
    			-- The SetClassLong function replaces the specified 32-bit (long)
    			-- value at the specified offset into the extra class memory
    			-- or the WNDCLASSEX structure for the class to which the
    			-- specified window belongs.
    			-- (from WEL_WINDOW)

    	set_class_small_icon (new_icon: WEL_ICON)
    			-- Replace the current icon for the class which this window
    			-- belongs to.
    			--
    			-- The SetClassLong function replaces the specified 32-bit (long)
    			-- value at the specified offset into the extra class memory
    			-- or the WNDCLASSEX structure for the class to which the
    			-- specified window belongs.
    			-- (from WEL_WINDOW)

    	set_z_order (z_order: POINTER)
    			-- Set the z-order of the window.
    			-- See class WEL_HWND_CONSTANTS for `z_order' values.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    			valid_hwnd_constant: valid_hwnd_constant (z_order)

    	show_horizontal_scroll_bar
    			-- Show the horizontal scroll bar.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	show_scroll_bars
    			-- Show the horizontal and vertical scroll bars.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	show_vertical_scroll_bar
    			-- Show the vertical scroll bar.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	show_with_option (cmd_show: INTEGER_32)
    			-- Set the window's visibility with `cmd_show'.
    			-- See class WEL_SW_CONSTANTS for `cmd_show' value.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    			parent_shown: parent /= Void implies parent.exists and parent.shown

    	update
    			-- Update the client area by sending a Wm_paint message.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	validate
    			-- Validate the entire client area of the window.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists

    	validate_rect (rect: WEL_RECT)
    			-- Validate the area `rect'.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    			rect_not_void: rect /= Void

    	validate_region (region: WEL_REGION)
    			-- Validate the area `region'.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    			region_not_void: region /= Void
    			region_exists: region.exists

    	win_help (help_file: STRING_GENERAL; a_command, data: INTEGER_32)
    			-- Start the Windows Help program with `help_file'.
    			-- `a_command' specifies the type of help requested. See
    			-- class WEL_HELP_CONSTANTS for `a_command' values.
    			-- 'data' is depandant on 'a_command'.  Check MSDN for more details.
    			-- (from WEL_WINDOW)
    		require -- from WEL_WINDOW
    			exists: exists
    			help_file_not_void: help_file /= Void

    feature -- Inapplicable

    	add_files (attribut: INTEGER_32; files: STRING_GENERAL)
    			-- Add `files' to the combo box. `files' may contain
    			-- wildcards (?*). See class WEL_DDL_CONSTANTS for
    			-- `attribut' values.
    			-- To check
    			-- (from WEL_COMBO_BOX_EX)
    		require -- from WEL_COMBO_BOX
    			exists: exists
    			files_not_void: files /= Void

    	find_string (index: INTEGER_32; a_string: STRING_GENERAL): INTEGER_32
    			-- Find the first string that contains the
    			-- prefix `a_string'. `index' specifies the
    			-- zero-based index of the item before the first
    			-- item to be searched.
    			-- Returns -1 if the search was unsuccessful.
    			-- (from WEL_COMBO_BOX_EX)
    		require -- from WEL_COMBO_BOX
    			exists: exists
    			index_large_enough: index >= 0
    			index_small_enough: index < count
    			a_string_not_void: a_string /= Void

    feature -- Element Change

    	set_default_processing (value: BOOLEAN)
    			-- Enable or disable default processing of window messages.
    			-- (from WEL_RETURN_VALUE)
    		ensure -- from WEL_RETURN_VALUE
    			value_set: default_processing = value

    	set_message_return_value (value: POINTER)
    			-- Set the window-procedure-return-value.
    			-- (from WEL_RETURN_VALUE)
    		ensure -- from WEL_RETURN_VALUE
    			has_return_value: has_return_value
    			value_set: message_return_value = value

    feature -- Notification

    	on_cben_beginedit_item
    			-- The user activated the drop-down list or clicked in the
    			-- control's edit box.
    			-- (from WEL_COMBO_BOX_EX)

    	on_cben_delete_item (an_item: WEL_COMBO_BOX_EX_ITEM)
    			-- An item has been deleted from the control.
    			-- (from WEL_COMBO_BOX_EX)

    	on_cben_endedit_item (info: WEL_NM_COMBO_BOX_EX_ENDEDIT)
    			-- The user has concluded an operation within the edit box
    			-- or has selected an item from the control's drop-down list.
    			-- (from WEL_COMBO_BOX_EX)

    	on_cben_insert_item (an_item: WEL_COMBO_BOX_EX_ITEM)
    			-- An item has been inserted in the control.
    			-- (from WEL_COMBO_BOX_EX)

    feature -- Notifications

    	on_cbn_closeup
    			-- The combo box has been closed.
    			-- (from WEL_COMBO_BOX)
    		require -- from WEL_COMBO_BOX
    			exists: exists

    	on_cbn_dblclk
    			-- The user double-clicks a string in the list box.
    			-- (from WEL_COMBO_BOX)
    		require -- from WEL_COMBO_BOX
    			exists: exists

    	on_cbn_dropdown
    			-- The list box is about to be made visible.
    			-- (from WEL_COMBO_BOX)
    		require -- from WEL_COMBO_BOX
    			exists: exists

    	on_cbn_editchange
    			-- The user has taken an action that may have altered
    			-- the text in the edit control portion.
    			-- (from WEL_COMBO_BOX)
    		require -- from WEL_COMBO_BOX
    			exists: exists

    	on_cbn_editupdate
    			-- The edit control portion is about to
    			-- display altered text.
    			-- (from WEL_COMBO_BOX)
    		require -- from WEL_COMBO_BOX
    			exists: exists

    	on_cbn_errspace
    			-- The combo box cannot allocate enough memory to
    			-- meet a specific request.
    			-- (from WEL_COMBO_BOX)
    		require -- from WEL_COMBO_BOX
    			exists: exists

    	on_cbn_killfocus
    			-- The combo box loses the keyboard focus.
    			-- (from WEL_COMBO_BOX)
    		require -- from WEL_COMBO_BOX
    			exists: exists

    	on_cbn_selchange
    			-- The selection is about to be changed.
    			-- (from WEL_COMBO_BOX)
    		require -- from WEL_COMBO_BOX
    			exists: exists

    	on_cbn_selendcancel
    			-- The user selects an item, but then selects another
    			-- control or closes the dialog box.
    			-- (from WEL_COMBO_BOX)
    		require -- from WEL_COMBO_BOX
    			exists: exists

    	on_cbn_selendok
    			-- The user selects a list item, or selects
    			-- an item an then closes the list.
    			-- (from WEL_COMBO_BOX)
    		require -- from WEL_COMBO_BOX
    			exists: exists

    	on_cbn_setfocus
    			-- The combo box receives the keyboard focus.
    			-- (from WEL_COMBO_BOX)
    		require -- from WEL_COMBO_BOX
    			exists: exists

    feature -- Output

    	io: STD_FILES
    			-- Handle to standard file setup
    			-- (from ANY)

    	out: STRING_8
    			-- New string containing terse printable representation
    			-- of current object
    			-- Was declared in ANY as synonym of tagged_out.
    			-- (from ANY)

    	print (some: ANY)
    			-- Write terse external representation of `some'
    			-- on standard output.
    			-- (from ANY)

    	frozen tagged_out: STRING_8
    			-- New string containing terse printable representation
    			-- of current object
    			-- Was declared in ANY as synonym of out.
    			-- (from ANY)

    feature -- Platform

    	operating_environment: OPERATING_ENVIRONMENT
    			-- Objects available from the operating system
    			-- (from ANY)

    feature -- Registration

    	is_registered: BOOLEAN
    			-- Is `window' registered?
    			-- (from WEL_WINDOW)

    	frozen register_current_window
    			-- Register `Current' in window manager.
    			-- (from WEL_WINDOW)
    		ensure -- from WEL_WINDOW
    			registered: is_registered

    feature -- Status settings

    	set_limit_text (limit: INTEGER_32)
    			-- Set the length of the text the user may type.
    		require
    			exists: exists
    			positive_limit: limit >= 0

    	set_text (a_text: STRING_GENERAL)
    			-- Set the window text
    		require -- from WEL_WINDOW
    			exists: exists
    		ensure -- from WEL_WINDOW
    			text_set_when_not_void: a_text /= Void implies text.is_equal (a_text)
    			text_set_when_void: a_text = Void implies text.count = 0

    invariant
    		-- from ANY
    	reflexive_equality: standard_is_equal (Current)
    	reflexive_conformance: conforms_to (Current)

    indexing
    	copyright: "Copyright (c) 1984-2006, Eiffel Software and others"
    	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
    	source: "[
    		Eiffel Software
    		356 Storke Road, Goleta, CA 93117 USA
    		Telephone 805-685-1006, Fax 805-685-6869
    		Website http://www.eiffel.com
    		Customer support http://support.eiffel.com
    	]"

    end -- class WEL_DROP_DOWN_COMBO_BOX_EX