Hello Sam,

Thank you for contacting Infragistics!

The UltraWebGrid was retired before IE11 was released therefore does not have support for this. If you want to support IE11 You will have to upgrade to the WebDataGrid/WebHierarchicalDataGrid (ASP.NET) or the igGrid/igHierarchicalGrid (jQuery) and use version v13.1 or later:

http://www.infragistics.com/support/supported-environments

You can go to the following link to see what controls were retired and what ASP.NET controls replaced them:

http://www.infragistics.com/community/blogs/taz_abdeali/archive/2011/11/17/asp-net-product-changes-in-2011-volume-2.aspx

You can also go to the following links to see samples for either control set:

Infragistics for ASP.NET:
http://www.infragistics.com/samples/aspnet/

IgniteUI for jQuery:
http://www.igniteui.com/