Hi Shachar,
You can achieve this by adding the column in GroupedColumns collection. The following is the code snippet
>>>>>>>>>>>>>>>>>>>>>>>>>>
GridTableDescriptor gd = this.gridGroupingControl1.GetTableDescriptor("TableName");
gd.GroupedColumns.Add("ColumnName",ListSortDirection.Descending);
>>>>>>>>>>>>>>>>>>>>>>>>>>
Also refer to our evaluation center for more information
http://www.syncfusion.com/support/evalcenter/default.aspx?cNode=5Best Regards,
Haneef