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Message: [QUOTE="Guest, post: 2948063"] Hi all, I have a ASP.net VB 2.0 application with AJAX Control Toolkit (updated just some minutes ago to latest 10618 from 18. June 2007). Initially everything works fine: I have an overview page, click on a link and a new window opens. Within the new window I have another button where a new child-window opens (by using JavaScript). In the child window I make a selection and click "OK". The child window closes and my parent window will be updated automatically. But now an error appears saying: "Two components with the same ID 'ctl00_PlaceHolderMain_InitiatorSelectionExtender' can't be added to the application." (Screenshot: [URL]http://img218.imageshack.us/img218/1881/twocomponentswithsameidwk7.jpg[/URL]) As said the initial load works fine, problem just appears after closing the newly opened child-window and the following update of the parent window. I use several AJAX Controls on my page (3 ListSearchExtender, 2 CalendarExtender, 2 MaskedEditExtender and 4 Animation Extender), the "InitiatorSelectionExtender" is a listSearchExtender. Of course I've searched the net for this problem and found some interesting pages, but: ([URL]http://www.codeplex.com/AtlasControlToolkit/WorkItem/View.aspx?WorkItemId=10945[/URL]) ListSearchExtender does not have this.id ([URL]http://forums.asp.net/p/1094818/1649900.aspx[/URL]) My Extenders are not hidden. Any ideas? Many thanks!! [/QUOTE]