Unknown Server Tag after upgrading project to 3.5

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I have an ASP.NET application that uses the Ajax Control Toolkit.* Today I opened the project in Visual Studio 2008 and was prompted to upgrade the project to .NET 3.5.* What made me click "Yes', I'll never know; but I sure got bit for it.

 

Now I'm getting build errors: Unknown server tag: ajaxToolkit:Accordion; same for AccordionPane. I tried:

*- Replacing my copy of AjaxControlToolkit.dll with the 3.5 version

*- Reverting the project to 2.0

*- Replaced the DLL with the 2.0 version again

*- Updated reference to the DLL

*- Verified the server (and the client debugging it) have System.Web.Extensions 2.0.0.0 and 3.5.0.0 registered in the GAC

 

I don't wanna have to create a new project and copy all the files over; what's the best way to undo this FUBAR?

 

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