matplotlib, wxPanel inside a wxPanel

[Sam]

Hello,

I'm currently creating a GUI, which consists of a main frame that
contains a menu bar,a toolbar and an empty panel, let's call it
main_panel.
Ideally, I'd like the following functionality: upon choosing an item
from the menu bar, a particular graph will be displayed inside
main_panel.

Now I've taken a look at the 'embedding_in_wx' example files that come
with matplotlib. Using this example, I can place a graph in a panel
(let's call it graph_panel), and display this in a frame. I can also
get NavigationToolbar2 to work completely.

On the other hand, when i create graph_panel and put this inside of
main_panel, NavigationToolbar2 does not work. The graph and toolbar are
both displayed, but none of the buttons on the toolbar do anything.

I'm beginning to think that what i'm trying to do isn't actually
possible, and that i'll need to put it in a frame instead, which is a
pity.

Can anyone please advise if what i'm trying to do is possible and if
so, provide a small example? I'm running windows XP, python 2.4,
wxpython 2.6.