private void PopulateMainGrid(int parentRowIndex)
 {
     Debug.WriteLine(
         $"ParentGridController.PopulateMainGrid: parent row {parentRowIndex}");
     EditorController.View.SetMouseCursorToWait();
     MainGrid.Controller.SetIdentifyingParentAndChildrenForList(
         GetIdentifyingParentAndChildrenForMainList(parentRowIndex));
     MainGrid.Populate();
 }