void OoDrawAccessibilityObserver_SelectionChanged(object sender, OoSelectionChandedEventArgs e)
 {
     //System.Diagnostics.Debug.WriteLine("Instance_SelectionChanged");
 }
 void fireSelectionEvent(OoSelectionChandedEventArgs aEvents)
 {
     if (SelectionEvent != null)
     {
         try
         {
             SelectionEvent.Invoke(this, aEvents);
         }
         catch (Exception ex) { Logger.Instance.Log(LogPriority.DEBUG, this, "cant fire selection event", ex); }
     }
 }