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this.gridDataBoundGrid1.AllowResizeToFit = false;
But turning AllowResizeToFit to false, will prevent the other columns to be sized to fit by default. If you want this to happen, then you would also add a call to ResizeToFit.
this.gridDataBoundGrid1.Model.ColWidths.ResizeToFit(GridRangeInfo.Cols(1, this.gridDataBoundGrid1.Model.ColCount), GridResizeToFitOptions.IncludeHeaders);
Here is a little sample showing this working.
http://www.syncfusion.com/Support/user/uploads/GDBG_SizeRowHeader_460c5d41.zip