# Menu (split, event)

A pull-down menu. The first child, the ``anchor'', looks just like a button, and when it is clicked, it pops up the second child. The second child can be any component, and is surrounded by a raised shadow. All other children are ignored. A menu requires a ZSplit somewhere in its ancestry; FormsVBT provides one of these by default.

NotInTrestle
  (Boolean, `FALSE`)
  If true, the menu is installed into a local ZSplit, rather than directly into Trestle, when popped up. Menus installed in Trestle may exceed the size of the containing window.

Behavior
  Pops up the second child when the first child is clicked, and keeps it there until the mouse button is released. Typically, the the second child contains a VBox of menu buttons (MButton, PopMButton, PageMButton, LinkMButton).
  An event is generated just after the anchor button is activated, and before the second child of Menu is popped up. This is useful for clients whose menu contents are changing dynamically and should be made consistent only when the menu is about to be displayed.
Shape
  The shape of its first child plus its shadow.