Hi ...this also applies for AutoFitRow method.
regards
Rale
Workbook wb = new Workbook();
wb.Worksheets.Clear();
Worksheet ws = wb.Worksheets.Add("New");
ws.Cells[5, 5].PutValue(34);
ws.Cells[5, 5].Style.Font.Size = 23;
ws.Cells.GroupRows(3, 9, true);
ws.AutoFitRows();
wb.Save(@"Result.xlsx", FileFormatType.Excel2007Xlsx);