gtk/gtk.go
func (v *Assistant) AddActionWidget(child IWidget) {
	C.gtk_assistant_add_action_widget(v.native(), child.toWidget())
}
func (v *Assistant) AddActionWidget(child IWidget) {
	C.gtk_assistant_add_action_widget(v.native(), child.toWidget())
}
// AddActionWidget is a wrapper around gtk_assistant_add_action_widget().