Visual studio 2010 ajax control toolkit tab container

We just upgraded to visual studio 2010 RC1 and all of a sudden our controls inside tabcontainer dis开发者_Go百科appeared from the designer file.

Actually, it all seemed good in the beginning, the project compiled nicely, but as soon as we did any change in the markup of a page and build the code for the controls inside the tabcontainer disappeared and we got errormessages like so

"Error 3 The name 'ddlPeriodicityStartInMonth' does not exist in the current    context "

Does anyone know if any changes are made to tabcontainer to visual studio 2010 or if this just is a bug?

Thanks in advance.

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Found this one also.

Workaround: Missing Declarations for Controls in Designer File

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I had the same problem. Check out the following link:

Microsoft Connect - Bug in generating the designer.cs file in VS2010

Hope it helps.