控件的两个事件都需要调用这个方法，新增的时候不写CellEditEnded，不然不会生效

  ItemsSourceChanged="DetailGrid_ItemsSourceChanged" CellEditEnded="DetailGrid_ItemsSourceChanged" 

/// <summary>
        /// 列表1合计
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void DetailGrid_ItemsSourceChanged(object sender, EventArgs e)
        {
            var vm = DataContext as PlateReplaceApplyFormVM;
            if (vm == null) return;

            CfgSaleOrderReviewItem.ColumnFooterRows.Clear();

            var gr = new GroupRow()
            {
                FontWeight = FontWeights.Bold
            };
            if (vm.SaleOrderList != null && vm.SaleOrderList.Count > 0) {
                CfgSaleOrderReviewItem.ColumnFooters.Rows.Add(gr);
                gr["ManagerName"] = "合计";
                gr["ProductQuantity"] = vm.SaleOrderList == null ? 0 : vm.SaleOrderList.Sum(p => Convert.ToInt32(p.ProductQuantity));
                gr["ProductTotalArea"] = vm.SaleOrderList == null ? 0 : vm.SaleOrderList.Sum(p => Convert.ToDouble(p.ProductTotalArea));
            }
        }