code: func (v *TreeModel) GetIterFromString(path string) (*TreeIter, error) {
  	var iter C.GtkTreeIter
  	cstr := C.CString(path)
  	defer C.free(unsafe.Pointer(cstr))
  	c := C.gtk_tree_model_get_iter_from_string(v.native(), &iter,
  		(*C.gchar)(cstr))
  	if !gobool(c) {
  		return nil, errors.New("Unable to set iterator")
  	}
  	t := &TreeIter{iter}
  	return t, nil
  }
docs: // GetIterFromString() is a wrapper around
  // gtk_tree_model_get_iter_from_string().