private void AddOrderSummaryItem(ExecuteOrderSummaryItem rangeSummaryItem, Order order)
 {
     ExecuteOrderSummaryItem orderSummaryItem = rangeSummaryItem.ChildSummaryItems.SingleOrDefault(P => P.Id == order.Id.ToString());
     if (orderSummaryItem == null)
     {
         orderSummaryItem = new ExecuteOrderSummaryItem(order);
         rangeSummaryItem.ChildSummaryItems.Add(orderSummaryItem);
         rangeSummaryItem.Update(orderSummaryItem, true);
         rangeSummaryItem.SetAvgPrice();
     }
 }