private void bindNonUserList()
        {
            string beginning = beginTextBox.Text;
            Tuple <bool, List <string> > tuple = controller.getRestUsers(username, beginning);

            if (!tuple.Item1)
            {
                Utils.Instance.errorAndExit("Error trying to access users records");
            }
            users = tuple.Item2;
            userList.ItemsSource = null;
            userList.ItemsSource = users;
        }