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Columns.Add throws an exception
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We are using 11.1..

In our GUI, when the user refreshed data on the grid, we call 

xamGrid.Columns.Clear

and then do something like this...

 

 if (xamGrid.Columns[colName] == null)

                {

                    textColumn = new TextColumn();

                    textColumn.Key = colName;

                    xamGrid.Columns.Add(textColumn);

                }

 

 

We get an "Object reference not set to an instance of an object" at  the line xamGrid.Columns.Add ..

The stack trace shows this

   at Infragistics.Controls.Grids.XamGridRowsManager.InvalidateGroupBy(Boolean reset).

 

How do I get rid of this error? I verified that the column count was zero after the call to the Columns.Clear