Could you elaborate on the approach you had used to load the UserControls in the PageViews? Did you followed the approach demonstrated in the online demo
? If so, you could add a reference to the user control in the ViewState and once there is an update, you could access the UserControl and rebind the RadGrid like demonstrated in the previously provided online demo.
If the issue still persist, I would like to ask you to open a support ticket, along with a runnable sample attached, in order to inspect and troubleshoot the problem locally for you.
the Telerik team
If you want to get updates on new releases, tips and tricks and sneak peeks at our product labs directly from the developers working on the RadControls for ASP.NET AJAX, subscribe to their blog feed