I'm working with Infragistics3.Documents.Excel.v11.1
I am applying styles to the cells:

    Dim mergedRegion1 As Infragistics.Documents.Excel.WorksheetMergedCellsRegion = _
      book.Worksheets(0).MergedCellsRegions.Add(0, 3, 0, 10)

    ' Set the value of the merged region
    mergedRegion1.Value = sTitle
    mergedRegion1.CellFormat.Alignment = HorizontalCellAlignment.Center
    mergedRegion1.CellFormat.Font.Bold = ExcelDefaultableBoolean.True

But, How can I change the size of the font??

Thank you in advance for your replay.