Commented Issue: Two components with the same id '{0}' can't be added to the application + filteredtextboxextender + updatepanel [27134]

I am using ajaxcontroltoolkit 4.1.51116

I have usercontrol1 which have forms field like textboxe with filteredtextboxextender.

I have taken this on another control from where i am opening fancybox popup and inside that usercontrol1.

First time it works great until i click on save button and my popup gets closed, it is showing me error like

Error: Sys.InvalidOperationException: Two components with the same id '{0}' can't be added to the application.

Source File: {websitepath}/ScriptResource.axd?d=wPieHs6t0D_3vdX0o6jGuxENo50qDQAI6KpZzOaUWxo9yqPP-ti3B-I8ReqWgk84TjzrH821Til527ueAUJxWZyLMgSWZ9e-GDW79kAbC16nGqq2-J1vH0LU75-t-UoUIR-VhA2&t=ffffffffc9f82b39

I have gone thru many formus and even issues on codeplex related with this but it is about autocomplete behavior but not about filteredtextboxextender.
Comments: Hi, I have two popup extender in one page. each have Ajax Combo box with different ID. But when page is post back following error comes. Line: 5734 Error: Sys.InvalidOperationException: Two components with the same id 'MainContent_ddlShipToState' can't be added to the application. i am using latest AJAX Tool Kit of June 2012 Please help me to get rid of this error. it urgent