private void UpdateButton_Click(object sender, RoutedEventArgs e)
        {
            Type type = DataContext.GetType();

            UserSavePopup messageBox = new UserSavePopup();

            messageBox.ShowDialog();
        }
        private void AddButton_Click(object sender, RoutedEventArgs e)
        {
            UserSavePopup messageBox = new UserSavePopup();

            messageBox.ShowDialog();
        }