gtk:menu-item-submenu (object)

object -- a gtk:menu-item widget
submenu -- a gtk:menu submenu, or nil

Accessor of the submenu slot of the gtk:menu-item class. The gtk:menu-item-submenu function gets the submenu underneath this menu item, if any. The (setf gtk:menu-item-submenu) function sets or replaces the submenu of the menu item, or removes it when a nil submenu is passed.