Sorry for the cross-post, but the issue involves both an UltraWebGrid and an UltraWebTab.  So, I may need some insight from both angles.  I've just got a very brief summary here.  If you have any helpful ideas, please respond to the full post in the other location (link below).

Summary:
I have a situation where I have an UltraWebGrid that resides on an UltraWebTab control.  I have client-side buttons for adding/deleting rows from the grid.  This grid behaves pefectly normal when the tab's AsyncMode is off.  However, when I turn the AsyncMode to On in the UltraWebTab, then the grid will re-issue the add/delete if the user performs a certain sequence of steps.

For more information, including a sample project, please see my other post, titled:
UltraWebGrid (with Async Callbacks involved) - Adds (or deletes) more rows when you're not looking!https://ko.infragistics.com/community/forums/f/retired-products-and-controls/37931/ultrawebgrid-with-async-callbacks-involved---adds-or-deletes-more-rows-when-you-re-not-looking/219160#219160

(Infragistics 2009 Vol 2, .NET 3.5, VS 2008, IE 7 and 8)

Thanks!

Jamie