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Sys.Extended is Undefined after upgrading to newest version of AjaxControlToolkit

Posted By:      Posted Date: October 08, 2010    Points: 0   Category :ASP.Net


I just recently updated to the latest version of the AjaxControlToolkit and now my TabContainers don't work (only thing i'm using the toolkit for). It looks like the client code to make the correct tab visible is never getting called. The error I'm getting with Firefox is "Sys.Extended is undefined", and with IE I get "'Sys.Extended.UI' is null or not an object".

I'm using the .NET framework 3.5

1). I already changed all the ScriptManagers in my project to ToolkitScriptManagers per a javascript error message I was getting earlier.
2). I already checked my web.config and it looks good:


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