### Tutorial
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## OptionMenu

An OptionMenu is a widget that allows the user to choose from a list of valid choices. The OptionMenu displays the selected choice. When the OptionMenu activated it displays a popup menu which allows the user to make a new choice.
Using an OptionMenu is simple; build a Gtk::Menu, then append menu items to it with the Gtk::MenuShell append() method. Then create the OptionMenu with a call to one of the following constructors:

`OptionMenu(); explicit OptionMenu(Gtk::Menu& menu, unsigned int index = 0);`

The first constructor creates an empty OptionMenu. The second constructor lets you specify the popup menu to display and selects the menu item specified by index, making it the newly selected value for the option menu.
You can set the popup menu to display by calling:

`void set_menu(Gtk::Menu& menu);`

and you can set the menu item to select by calling:

`void set_history(unsigned int index);`

Don't forget to connect to the option menu changed signal with something like this:

`option_menu->sig_changed().connect(slot(this, &MyClass::changed_handler));`

You can retrieve the popup menu by calling:

`Gtk::Menu* get_menu() const;`

and you can get the index of the currently selected menu item by calling:

`int get_history() const;`

If you need to change the menu you must remove the current menu first with:

`void remove_menu();`

and that's all there is.

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