.NET data types in Visio 2003

Hi,

I have a little question concerning the data types that are available in
visio 2003 when designing you application in UML.

The application in question will be developed in VB .NET (.NET V1.1). During
the design there are a number of base types available in Visio 2003
(VB::Object, VB::Boolean,..)

Now to come to the core of my question: Is it possible to import datatypes
of the .NET Framework so I can use them in my design or do I have to create
placeholders for them myself?

If there is a library available for download so I can use other data types
next to the base ones, that would be ideal.

For example, one of my classes contains a collection of threads neither of
those types are available in Visio 2003. Collection beeing pretty basic
(System.Collection) and Thread beeing from System.Threading

Thanks in advance,

-SL33PY