.NET Class Library data types?   

I have a copy of Visio 2007 Professional installed and I would like to create 
class diagrams for an eventual .NET project.  Some of my classes inherit from 
the .NET framework, so I am wondering how I can get models of the .NET 
Framework Class Library loaded into Visio Pro 2007 -- all I see are its 
primitive types.

Thanks!

date: Tue, 12 Feb 2008 19:55:00 -0800   author:   John