SetTrayIcon()
function, you can use this attribute to add
a context menu to the application's tray icon. Just set this attribute
to an identifier of a MOAI object derived from Menu class
and your application's icon in the system tray will get a context
menu. Whenever the user presses the right mouse button on the icon in
the system tray, the context menu will be shown.
See Context menus for an example.