gtk/gtk.go
func (v *TreePath) native() *C.GtkTreePath {
	if v == nil {
		return nil
	}
	return v.GtkTreePath
}
func (v *TreePath) native() *C.GtkTreePath {
	if v == nil {
		return nil
	}
	return v.GtkTreePath
}
// native returns a pointer to the underlying GtkTreePath.