Give a look to the DataGrid of my Mvc Controls Toolkit here: http://mvccontrolstoolkit.codeplex.com/wikipage?title=Update/Insert/Delete/%20Templated%20Datagrid

and to its associated Master-Detai Form that do exactly an ajax call:

http://mvccontrolstoolkit.codeplex.com/wikipage?title=DetailFormFor%20Helper

When data arrive from ajax also the grid rows arre updated and the new values are hilighted.

Here a screenshot and links to tutorials samples etc: http://mvccontrolstoolkit.codeplex.com/wikipage?title=DataGrid%20and%20Pager%20Complete%20Example