arrow and function key events in matplotlib

I'm trying to figure out how to capture arrow and function
key events in matplotlib running with PyQt4. I can get
ASCII characters, but not things like F1 or left arrow.

This is a repeat request, but I'm not sure my earlier
posting (which got no response) made it to the list,
as I was not a subscriber at the time.

In any case, I wanted to make sure that nobody knows
how to do this before filing a feature request.

  - Bob Lewis