//  public VisualHost Host { get { return VisualHost; } }

        /// <summary>
        /// Leave focus
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        public void NonFocus(object sender, RoutedEventArgs e)
        {
            VisualHost.IsFocused = false;
            VisualHost.UnFocusSpace();
        }