Add Edit/Close dialogs for MG and CM. Ensure that trade file is reloaded after edit.

ViewModels/MGSHMomentumViewModel.cs

@@ -1106,6 +1106,7 @@ namespace TradeBlotter.ViewModels
       String strMessage = String.Format("Edited Position for {0} Purchase Date:{1} Purchase Price:{2}, Trailing Stop:{3}. A backup was created.",
       selectedPosition.Symbol, selectedPosition.PurchaseDate.ToShortDateString(), Utility.FormatCurrency(selectedPosition.PurchasePrice), Utility.FormatCurrency(selectedPosition.TrailingStopLimit));
       MessageBox.Show(strMessage, "Edit Position");
+      LoadSessionFile();
     }
 
     public void DisplayBollingerBandCommandPosition()