problem with wx.FindWindowAtPointer

hi,
I'm on win7(64), py2.7(32bit),wxpy2.9.4.0 and it seems that
wx.FindWindowAtPointer() returns None on scrollbars. You can verify it
with the demo pyshell (point the mouse on the toolbar and execute the
function from the shell).

I've tried to circumvent this using the pyhook module which gives me
the handle of the clicked window but I'm not able to get the wxpy
control from the handle. I've discovered a wx.Window_FromHWND function
but I don't know how to provide the first argument (it is a parent I
suppose, but I don't have it in my context). While trying I get an
error with a wx c++ function called wxassociatewinwithhandle which
seems to know the correspondence between wxwindow and handle. Is there
such a function available on wxpy?

any suggestion appreciated

Marco