private void UserControl_Loaded(object sender, RoutedEventArgs e)
        {
            SharePointService sharePointService = new SharePointService();
            List <SPWebpart>  webparts          = sharePointService.GetWebparts(this.SiteSetting, this.FileLeafRef);

            foreach (SPWebpart wp in webparts)
            {
                AddNode(WebpartsTreeView.Items, wp.Title, wp, Brushes.Black);
            }
        }