private void RemoveFromBasket_Click(object sender, RoutedEventArgs e)
 {
     if (BasketList.SelectedItem != null)
     {
         order.ItemsInBasket.Remove((MenuItem)BasketList.SelectedItem);
         BasketList.UnselectAll();
     }
     if (order.ItemsInBasket.Count == 0)
     {
         HideBasket();
     }
 }