Trouble Getting mate info (GetSupplementalfaces)

Has anyone out there tried using the getSupplementFaces call on Mate2?  I can't seem to get it to work.

I am not sure if it is the right way to do what I am trying to do.  I would like to get the names of the entities the selected mate is attached to.

example:

Part1 1 has a coincidental mate between

    Part1s Front Plane

    Assy1s Front Plane

How do I return the names of these entities.

Any help would be greatly appreciated.

In advance thank you very much!

SolidworksApi macros