private void SetUI(ListItemsControl sender, ItemContentLoadingEventArgs args)
        {
            var data = args.DataContext as ListViewItemMode;
            FrameworkElement content = null;

            switch (data.flag)
            {
            case "txt":
                content = GetTxtUI(data.txt);
                break;

            case "list":
                content = GetGridView(data.gridViewItems);
                break;
            }
            args.SetContent(content);
        }
 private void ListItemsControl_ItemContentUnloaded(ListItemsControl sender, ItemContentUnloadedEventArgs args)
 {
 }