gtk:menu-button-primary (object)

object -- a gtk:menu-button widget
setting -- a boolean whether the menu button acts as a primary menu

Accessor of the primary slot of the gtk:menu-button class. The gtk:menu-button-primary function returns whether the menu button acts as a primary menu. The (setf gtk:menu-button-primary) function sets the property. Primary menus can be opened with the F10 key.

Since 4.4