The easiest way to do this is to use the Feature Picker in the grid designer.

Hello,

It seems to me that your ultraGrid is set to be OutlookGroupBy and that's why you are seeing the mentioned box.

What you could do is set in design time the following:

ultraGrid1->DisplayLayout -> ViewStyleBand  -> Vertical

the same applies and for run time.

If you would like to keep the OutlookGroupBy style you could set the following in the InitializeLayout event your UltraGrid :

private void ultraGrid1_InitializeLayout(object sender, Infragistics.Win.UltraWinGrid.InitializeLayoutEventArgs e)
        { 

          e.Layout.GroupByBox.Hidden = true;
        }

Please let me know if you need any other assistance.