private void CloseVLC()
 {
     foreach (var item in CamerasList.Items)
     {
         ContentPresenter cp = CamerasList.ItemContainerGenerator.ContainerFromItem(item) as ContentPresenter;
         UserControl1     tb = Utility.FindVisualChild <UserControl1>(cp);
         if (tb != null)
         {
             //  tb.CloseVLC();
             tb.MouseDown  -= UserControl1_MouseDown;
             tb.TouchLeave -= UserControl1_TouchLeave;
             tb.CloseVLC();
         }
     }
 }