private void DataGrid_LoadingDataSource(object sender, Newegg.Oversea.Silverlight.Controls.Data.LoadingDataEventArgs e)
        {
            PagingInfo p = new PagingInfo
            {
                PageIndex = e.PageIndex,
                PageSize  = e.PageSize,
                SortBy    = e.SortField
            };

            _Facade.Query(this.DataGrid.QueryCriteria as GroupBuyingQueryVM, p, (s, args) =>
            {
                if (!args.FaultsHandle())
                {
                    this.DataGrid.TotalCount  = args.Result.TotalCount;
                    this.DataGrid.ItemsSource = args.Result.Rows.ToList("IsChecked", false);
                }
            });
        }