A menu-item% is a plain string-labelled menu item. Its parent must be a menu% or popup-menu%. When the user selects the menu item, its callback procedure is called.
Creates a new menu item in parent. The item is initially shown, appended to the end of its parent. The callback procedure is called (with the event type 'menu) when the user selects the menu item (either via a menu bar or popup-menu in canvas<%>).
See set-label for information about mnemonic ampersands (``&'') in label.
If shortcut is not #f, the item has a shortcut. See get-shortcut for more information.
If help is not #f, the item has a help string. See get-help-string for more information.