gtk/gtk.go
func (v *Orientable) SetOrientation(orientation Orientation) {
	C.gtk_orientable_set_orientation(v.native(),
		C.GtkOrientation(orientation))
}
func (v *Orientable) SetOrientation(orientation Orientation) {
	C.gtk_orientable_set_orientation(v.native(),
		C.GtkOrientation(orientation))
}
// SetOrientation() is a wrapper around gtk_orientable_set_orientation().