Hello,
I use version7.2.20072.61. When I use Rows.addNew() to add a new row, it always return null. Is it a bug? Has it been fixed in new version?
Make sure that you're allowing the addition of new rows in your grid.
You can do this on the whole grid by setting its DisplayLayout.AllowAddNewDefault property to AllowAddNew.Yes (or Infragistics.WebUI.UltraWebGrid.AllowAddNew.Yes). You can instead set this for an individual band by setting that band's AllowAdd property to AllowAddNew.Yes.