The pdf with the PowerTools in Section 5.3 mentions an add-in available at http://www.codeplex.com/vsdbpro. This add-in is not there.

Can you make it available, or otherwise provide some working sample code for this feature

Re: Visual Studio Team System - Database Professionals Schema View extensibility Add-in

Gert Drapers - MSFT

Please send me email mail via my blog site and I can send it to you.

We are still updating the sample side, not enough hours in a day.