A wx:menu% object is a pop-up or pull-down list of items, one of which may be selected before the menu goes away. Menus can be used to construct either menu bars or popup menus.
Each menu item has an associated non-negative integer identifier. This identifier is used when an item is selected by the user (see also on-menu-command). It can also be used to change the menu item in some way.
A menu can be used in only one menu bar or as a pop-up menu.
For information about special ``Help'' menus, see append in wx:menu-bar%.
If the title argument is not null, it is be used when the menu is used as a pop-up menu on some platforms. If func is not null, it will be called when the user selects an item by a call to popup-menu or popup-menu.