See Also: CheckMenuItem Members
A CheckMenuItem is a menu item that maintains the state of a boolean value in addition to a Gtk.MenuItem's usual role in activating application code.
A check box indicating the state of the boolean value is displayed at the left side of the Gtk.MenuItem. Activating the Gtk.MenuItem toggles the value.
Whether the CheckMenuItem is 'on' or not can be determined with the CheckMenuItem.Active property.