labelWidget label; interactive widgets also use it for ID generation. A ## suffix can distinguish IDs without displaying the suffix.
shortcutShortcut label displayed in the menu; this text does not register a key binding.
selectedWhether the item is currently selected; this by-value state is not written back.
enabledWhether the item or pushed option is enabled.
True when the item is activated this frame; this is an activation event, not a persistent selected state.
Display a menu item and report whether it was activated.