gtk/gtk.go
func (v *Dialog) AddActionWidget(child IWidget, id ResponseType) {
	C.gtk_dialog_add_action_widget(v.native(), child.toWidget(), C.gint(id))
}
func (v *Dialog) AddActionWidget(child IWidget, id ResponseType) {
	C.gtk_dialog_add_action_widget(v.native(), child.toWidget(), C.gint(id))
}
// AddActionWidget() is a wrapper around gtk_dialog_add_action_widget().