This attribute can be used to set the type for this menu item.
The following types are currently possible:
Normal-
Normal menu item.
Toggle-
Toggle menu item with a checkmark.
Radio-
Radio menu item that forms a group with its neighbouring radio menu items.
Only one member of the group can be selected at a time.
About-
Designate item as the about menu item. Only supported on macOS. (V2.0)
Help-
Designate item as the help menu item. Only supported on macOS. (V2.0)
Preferences-
Designate item as the preferences menu item. Only supported on macOS. (V2.0)
Quit-
Designate item as the quit menu item. Only supported on macOS. (V2.0)
Note that when setting this attribute to one of the types only supported on macOS,
RapaGUI will move the item to its appropriate position according to macOS' styleguide,
e.g. the "About", "Preferences", and "Quit" menus are part of the program menu on macOS.
On non-macOS systems, those special types don't have any effect and RapaGUI will just
ignore them.