The display state for a toggle box or a toggle-box menu item.
Data type: LOGICAL
Access: Readable/Writeable
Applies to: MENU-ITEM widget, TOGGLE-BOX widget
When this attribute is TRUE, the center of the toggle is filled to represent the "on" state of the value associated with the widget. Setting this attribute to FALSE removes the fill from the center of the toggle to represent the "off" state for the value associated with the widget.