Could not find UpdatePanel with ID 'xxx'. If it is being updated dynamically then it must be inside another UpdatePanel

Question

I have a page with Ajax Tab controls, within one of the tabs is a webcontrol that as a Telerik RadGrid, with Edit forms pointing to another web control. That edit form also cont

Answer 1

To start off with the troubleshooting, I personally will try to remove parts of the code and thus designate the reason for the error. For example, remove the grid and load the user control dynamically on tab click to see if the problem remains, then remove the inner ajax tab or the modal popup and perform another check, etc.