public void OnExitOverlay(object o, ExitOverlayEventArgs e)
 {
     // this is vurnerable to exceptions thrown in the handler methods
     if(ExitOverlay != null){
         ExitOverlay(o, e);
     }
 }
 void HandleExitOverlay(object o, ExitOverlayEventArgs e)
 {
     IM.PointerZoom += ZoomHandler;
 }
 private void HandleExitOverlay(object o, ExitOverlayEventArgs e)
 {
     turnable = true;
     im.PointerUp += HandleClick;
     im.PointerDrag += HandlePointerDrag;
 }