Placing-trade-in-PostExecute-method

@Cone, thanks for the insight. I came up with two approaches that appear to work. I'm posting below in case it's helpful to anyone that wants to place trades in the PreExecute() or PostExecute() method.

CODE:
              foreach (IndexKVolHolder i in indexKVolList)
              {
                  //Method 1
                  var iBar = participants.Where(b => b.Symbol == i.index).FirstOrDefault();
                  Transaction t1 = PlaceTrade(iBar, TransactionType.Buy, OrderType.Market);
                  t1.Quantity = 100;

                  //Method 2
                  foreach(BarHistory ib in participants)
                  {
                     if (ib.Symbol == i.index)
                     {
                        BarHistory myBars = ib;
                        Transaction t2 = PlaceTrade(myBars, TransactionType.Buy, OrderType.Market);
                        t2.Quantity = 200;
                     }
                  }
               }