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 contains Ajax Tabs and on one of those tabs, there is an Ajax modal popup of yet another webcontrol.

The initial webcontrol works fine when used on its own page, but the edit form fails to appear when the control is used within the Ajax Tabs as desired. The script manager is throwing the following error:

Microsoft JScript runtime error: Sys.InvalidOperationException: Could not find UpdatePanel with ID 'xxx'. If it is being updated dynamically then it must be inside another UpdatePanel.

Any assistance with this would be appreciated.

Answer 1

This issue occurs in Telerik RadAjaxManager when you adds invisible controls to it.

So in case of your in need to show/hide AJAX controls, it is recommended to add AJAX settings grammatically from you code behind (based on control visibility state) instead of ASPX code.

For more information: Please check this answer on the Telerik forums.