Please refer to this link for more information on this issue:

 

https://www.infragistics.com/community/forums/f/ultimate-ui-for-asp-net/16332/ultrawebtab-websplitter-and-webdatagrid-jscript-error#16332

It turns out that the not wrapping was being caused by this line

wbk.ActiveWorksheet.MergedCellsRegions.Add(UltraWebGrid1.Rows.Count + 16 + i, 1, UltraWebGrid1.Rows.Count + 16 + i, 3);

Is is possible to have a MergedCellRegion wrap text AND to have the cell expand vertically to fit the text? Thoughts?