gtk/gtk.go
func (v *MenuButton) SetDirection(direction ArrowType) {
	C.gtk_menu_button_set_direction(v.native(), C.GtkArrowType(direction))
}
func (v *MenuButton) SetDirection(direction ArrowType) {
	C.gtk_menu_button_set_direction(v.native(), C.GtkArrowType(direction))
}
// SetDirection is a wrapper around gtk_menu_button_set_direction().