gtk:menu-button-popup (object)

object -- a gtk:menu-button widget
menu -- a gtk:menu widget, or nil to unset and disable the button

Accessor of the popup slot of the gtk:menu-button class. The gtk:menu-button-popup function returns the menu that pops out of the button. If the button does not use a menu, this function returns nil. The (setf gtk:menu-button-popup) function sets the menu that will be popped up when the menu button is clicked, or nil to dissociate any existing menu and disable the button.

If the menu-model or popover are set, those objects are dissociated from the menu button, and those properties are set to nil.