wxPython Linux Compatibility question

[Kiran]

Hello All,
  My question is regarding MDI Windows Support for Linux in wxPython.
I am currently writing an application which uses MDI.

I have seen that in linux, it basically makes all MDI windows tabs
(without close, minimize, or maximize buttons and other tools such as
cascade and stuff), which is fine by me.  I however want to know which
MDI window the user has focus of so that the user has an option of
closing the window if they so desired under Linux.  How would I find
this out?

thanks a lot!
-- Kiran