Hi Hrcko,
If you like to have numbered rowheaders in a GridDataBoundGrid, try these property settings. This will help you.
this.gridDataBoundGrid1.BaseStylesMap["Row Header"].StyleInfo.CellType = "Header";
this.gridDataBoundGrid1.Model.Options.NumberedRowHeaders = true;
Below is the forum thread that discuss with this task in GridGroupingControl.
http://www.syncfusion.com/support/Forums/message.aspx?&MessageID=52552.
Best regards,
Haneef