Disabling Checkboxes in a GridGroup?

private void gridGroupingControl1_QueryCellStyleInfo(object sender, GridTableCellStyleInfoEventArgs e)
{
	if(e.Style.CellType == "CheckBox")
	{
		GridRecordRow rec = this.gridGroupingControl1.Table.DisplayElements[e.TableCellIdentity.RowIndex] as GridRecordRow;
		if(rec != null)
		{
			DataRowView dr = rec.GetData() as DataRowView;
			if(dr != null && dr["Col1"].Equals("no"))
				e.Style.Enabled = false;
		}
	}
}