This question is locked. New answers and comments are not allowed.
I have been working with this for a couple of days. A project showing the issue is attached. To see the behaviour, start the project. Click on the Edit User link on the first tab. When the edit user page appears, click on Insert or Edit on the grid. The popup that appears has either an Update or Insert button but neither fire. That is the same in Chrome and IE9. In IE9 Compatibility mode the Update or Insert button on the popup fire but are routed to the Edit action rather than the UpdateUser or InsertUser actions as defined on the grid.