func (v *TreeModel) GetPath(iter *TreeIter) (*TreePath, error) {
	c := C.gtk_tree_model_get_path(v.native(), iter.native())
	if c == nil {
		return nil, nilPtrErr
	}
	p := &TreePath{c}
	runtime.SetFinalizer(p, (*TreePath).free)
	return p, nil
}
func (v *TreeModel) GetPath(iter *TreeIter) (*TreePath, error) {
	c := C.gtk_tree_model_get_path(v.native(), iter.native())
	if c == nil {
		return nil, nilPtrErr
	}
	p := &TreePath{c}
	runtime.SetFinalizer(p, (*TreePath).free)
	return p, nil
}
// GetPath() is a wrapper around gtk_tree_model_get_path().