gtk:combo-box-popup-shown (object)

object -- a gtk:combo-box widget
setting -- a boolean whether the combo boxes dropdown is popped up

The accessor for the popup-shown slot gets or sets whether the combo boxes dropdown is popped up. Note that this property is mainly useful, because it allows you to connect to the "notify::popup-shown" signal. The gtk:combo-box implementation is deprecated since 4.10. Use the gtk:drop-down widget instead.