Rethemeable app

[Erik Simonsen <erik pinksheets com>]

I have an app that reads its own gtk.rc file when it runs.  I would like
it if a user could, from within the program, retheme the app by loading
another rc file.  I think I can load an additional rc file on top of the
rc's i'd loaded previously without any problems.  However, I'd prefer to
be able to unload the initial rc file before any new ones are loaded. 
Otherwise, I believe that any properties specified in the first rc but
not specified in the next rc would linger.  By the time the user tried 
5 or 6 themes, I'd imagine that there would be a lot of unexpected
properites hanging around.

Is there a way to reset the whole rc subsystem to system default without
reloading the application?

Thanks,
Erik