[Boost-users] wrapping callback fonction from fltk2

I'm a basic user of boost::python, I have just start with it this month and I look into wrapping FLTK2, I have wrapped the basics Widgets and they work great, except for collabck fonctions. I have find an old message in this mailng list refering to the same poblem with fltk but honestly I didn't understand. http://lists.boost.org/Archives/boost/2001/04/10820.php if someone can help me with an exemple I will be grateful plz I need help