Inheritance: IDraggingEventArgs
        void gr_Dragging(Windows.UI.Input.GestureRecognizer sender, Windows.UI.Input.DraggingEventArgs args)
        {
#if (DEBUG)
            System.Diagnostics.Debug.WriteLine("gr_Dragging");
#endif
        }
 /// <summary>
 /// 
 /// </summary>
 /// <param name="sender"></param>
 /// <param name="args"></param>
 void OnDragging(GestureRecognizer sender, DraggingEventArgs args)
 {
 }