private void Button_Click_1(object sender, RoutedEventArgs e)
        {
            AddingWaiter aw = new AddingWaiter();

            aw.Show();
            this.Close();
        }
 private void waiter_Click(object sender, RoutedEventArgs e)
 {
     AddingWaiter aw = new AddingWaiter();
     aw.Show();
     this.Close();
 }