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Sorry, I also added the following line to backend_wxagg to get my demo 
to work:
from backend_wx import FigureManager
Anyhow, I've added this to CVS, but you can just as easily modify your 
copy of the affected file.
Cheers!
Andrew

Hi plotters,
I've shamelessly modified dynamic_demo_wx.py to create 
dynamic_image_wxagg.py, attached. This is my initial attempt to get 
matplotlib to dynamically update images. Basically it all works 
hunky-dory except 1) an apparent memory leak and 2) flicker when I run 
this in linux (haven't tested other OSes). I offer #1 to John or other 
memory-leak hunters out there and ask if any WXpert can address #2. 
I've googled a bit and it appears the WX backend (from which WXAgg is 
derived) does the Right Thing and calls wxClientDC on a non-OS generated 
redraw request, which is supposed to reduce or eliminate flicker. The 
other tip is to catch EVT_ERASE_BACKGROUND, which I've also done to no 
apparent improvement. Thus, I ask for help -- any suggestions on how to 
eliminate this flicker?
John -- feel free to stick this in examples if you think it's worthy.
Cheers!
Andrew