I figured it out on my own. My solution is simple and should actually be a feature in the UltraGrid. I currently have a class that inherits from UltraGrid called IBSBaseGrid. So, I do the following override:

protected override void OnInitializeGroupByRow(InitializeGroupByRowEventArgs e)
{
   base.OnInitializeGroupByRow(e);
         
   e.Row.Column.SortIndicator = SortIndicator.Descending;
   e.Row.RefreshSortPosition();
}

It should be easy to add a GroupByRowSortIndicator Property to the UltraGrid. Where do I add that request?

-Ken

    If you want to submit a feature request to Infragistics, you can do it here: Submit a feature request to Infragistics

    But the sorting of the GroupByRows is determined by the sorting of the grouped column as you have obviously discovered. Why would you need an additional property for this when there is already a property to do it? That would be redundant.