Hi, I accidentally deleted a message from Jeremy in which
> he had code snippets that worked with the WX backend in
> its current CVS incarnation.
Have you read http://matplotlib.sourceforge.net/backends.html?
There is nothing special about invoking the wx backend. The two ways
of invoking a given backend are described on that page.
If it's not clear after reading, please let me know so I can update
the documentation (or provide suggestions for what can be clearer).