void btnDelete_Click(object sender, DeleteStringListItemDRoutedEventArgs e)
        {
            var itm = sender as StringListItemControl;

              var e2 = new StringListItemRoutedEventArgs(RemovedItemEvent);

              e2.Item = _items[(int)e.Id];

              RemoveListItem(itm, e.Id);

              RaiseEvent(e2);
        }
        void btnDelete_Click(object sender, RoutedEventArgs e)
        {
            var btn = sender as RoundMetroButton;

              var e2 = new DeleteStringListItemDRoutedEventArgs(RemovedItemEvent);

              e2.Id =  (int)btn.Tag;

              RaiseEvent(e2);
        }