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How Do I implement Optional Parameters

How Do I implement Optional Parameters

(OP)
  I am experimenting with COM+ programming, and have run into a slight snag.  I am using C++ Builder 5.0 Pro to build an ActiveX Library, and testing the library under MS Access.  I have created an Automation object which has a method, add.  This method is designated in the tlb as having an optional parameter, Key. However, when I use the object, If I don't pass the supposedly optional parameter, the User environment compiler crashes. If I include the optional param, everything works fine.   If I try to overload the Add method, the Library won't compile.  
  Main thrust of my question, how do I properly implement an optional parameter?

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