George,
Every Class, Datatype, or Interface you create in a model appears in
the list of available datatypes the Parameters Properties and other
dialog boxes display.
You can add any of these by dragging out a shape onto the diagram, of
course. If you don't want/need the actual shape, you can also choose
New | Class, New | Datatype, or New | Interface from the context menu
of your package (named Top Package by default) in the Model Explorer.
The Model Explorer also lets you add interfaces and datatypes to the
builtin datatype sets.
Michael J. Hunter
Microsoft
michhu-at-online-dot-microsoft-dot-com
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