Hi Vin,
AFAIK, the only chance from an add-in is to create a toolwindow, set it to
be not dockable and not floating (so it behaves as a document window) and
put a TabControl inside it. Other than that, you will need the VSIP/VS 2005
SDK.

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Best regards,
Carlos J. Quintero
MZ-Tools: Productivity add-ins for Visual Studio
You can code, design and document much faster:
http://www.mztools.com
> Hi
>
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> Thanks,
> Vin