Frame without focus - notification window

Hello,

is it possible to create and show a Frame that will not automatically
take the focus? I have tried Enabled(False) before I call Show() but
this has no effect (at least on wxGTK) or is there something I can do on
EVT_ACTIVATE to give the focus back to where it came from?

I want to notify the user about an event with a small popup, like for
example E-Mail and IM-clients do. I would prefer a solution that relies
only on wx, no native API-calls into the desktop-environment.

TIA,
Bernd