Missing UML Class diagram template

I have VS2010 Ultimate installed and was trying to experiment with some of the new architecture tools.  I was trying to add a new 'UML Class Diagram' to my Modeling project, but that template is missing from the Add New Diagram dialog.  (The UML Sequence diagram template is also missing).  All I have in the dialog is UML Use Case Diagram, UML Activity Diagram, UML Component Diagram, and Layer Diagram. 

Any ideas?  Do I need to reinstall?

Thanks,

Tim

Source: http://social.msdn.microsoft.com/Forums/en-US/vsarch/thread/cfb82a1e-b45f-4e8c-bcec-329e1402ca15

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