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Ultra Grid Group by
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Hi

I have an ultragrid which I allow group by on.  I also allow updating, deleting and inserting which gives me a null reference error.  I'm not sure why and I've considered disabling the buttons on the group by event which I was able to do (example a).  But when the group by is turned off how is there a better way to trap that? 

Is it common practive to NOT allow Insert/Update/Delete when grouping?  If so, Is there a better way to disable it?

Example A)

private void UltraGridList_AfterSortChange(object sender, BandEventArgs e)
        {
            //isGroupBySet = false;
            //for (int i = 0; i < e.Band.SortedColumns.Count; i++)
            //{
            //    UltraGridColumn sortColumn = e.Band.SortedColumns[i];
            //    if (sortColumn.IsGroupByColumn)
            //    {
            //        isGroupBySet = true;
            //    }
            //}
            //if (isGroupBySet == true)
            //{
            //    btnInsert.Enabled = false;
            //    btnDelete.Enabled = false;
            //    this.UltraGridList.DisplayLayout.Override.AllowUpdate = DefaultableBoolean.False;
            //}
            //else
            //{
            //    btnInsert.Enabled = true;
            //    btnDelete.Enabled = true;
            //    UltraGridList.Enabled = true;
            //    this.UltraGridList.DisplayLayout.Override.AllowUpdate = DefaultableBoolean.True;
            //}
        }
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