Create a menu with the Menu method, to be displayed
later with the post method.
$menu = $parent->Menu(options)
The standard configuration options that apply to Menu are:
Other options are:
Sets the width of the edges for the active menu item.
Specifies items to create in the menu as a list
The command to invoke before the menu is posted, for example,
to update the state of the menu items.
Whether or not to allow the menu to be "torn off." Default is 1.
Color of the selection box for checkbuttons or radiobuttons.