Hi,

We ran into this same issue and our point of failure is HeaderCellControl.CancelDrag and unchecked ResolveColumn; only our TemplateColumn -typed columns are affected.

Unfortunately we cannot upgrade to 12.2 SR because it causes other issues we don't have time to resolve.

Our current workaround is as follows. Is this "enough" or should we actually release created objects at some point.

    public class BFTemplateColumn : TemplateColumn
    {
        protected override CellBase GenerateHeaderCell(RowBase row)
        {
            return new BFHeaderCell(row, this);
        }
 
        public class BFHeaderCellControl : HeaderCellControl
        {
            protected override void CancelDrag(bool columnUnfixed, bool fireEvent)
            {
                if (this.ResolveColumn() != null)
                    base.CancelDrag(columnUnfixed, fireEvent);
            }
        }
 
        public class BFHeaderCell : HeaderCell
        {
            public BFHeaderCell(RowBase row, Column column)
                : base(row, column)
            {
            }
            protected override CellControlBase CreateInstanceOfRecyclingElement()
            {
                return new BFHeaderCellControl();
            }
        }
    }

Valerie, 

Thanks for example. Worked for me. Appreciate your help.

Valerie, 

Thanks for the reply. As you suggested, I downloaded the service release "NetAdvantage for Silverlight Line of Business 2011 Vol. 2 - Service Release" - Version 11.2.20112.2068. I compared dlls in here with the ones that I have(11.2.20112.1010) and there was no change in the dlls for the XamGrid. 

Kindly suggets.