[plt-scheme] define-macro expansion

Hi all,

Is there a way to expand a define-macro? Neither backtrace nor expander
language help much in this situation. I've checked the documentation of
define-syntax and define-macro but found no useful reference to this
issue although i'm sure some have already faced the same problem.

Cheers,
-- 

Paulo J. Matos : pocm [_at_] mega . ist . utl . pt
Instituto Superior Tecnico - Lisbon
Computer and Software Eng. - A.I.
 - > http://mega.ist.utl.pt/~pocm
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        -> God had a deadline...
                So, he wrote it all in Lisp!