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