/// <summary>
        /// Retrieve the input element at the given screen point.
        /// </summary>
        /// <param name="point">The point for hit testing.</param>
        /// <param name="window">The TouchWindow for hit testing.</param>
        /// <returns>UIElement result of the hit test. Null if no elements were located.</returns>
        private static UIElement GetElementAtScreenPoint(Point point, Window window)
        {
            if (!window.IsVisible)
                return null;

            Point windowPoint = window.PointFromScreen(point);

            IInputElement element = window.InputHitTest(windowPoint);
              //  Console.WriteLine("[DEBUG-KCManager] "+ element.GetType());
            if (element is UIElement)
                return (UIElement)element;
            else
                return null;
        }
        private static UIElement GetElementAtScreenPoint(Point point, Window window)
        {
            if (!window.IsVisible)
            {
                return null;
            }

            Point windowPoint = window.PointFromScreen(point);

            IInputElement element = window.InputHitTest(windowPoint);
            if (element is UIElement)
                return (UIElement)element;
            else
                return null;
        }