SDL+GTK problem

I’m trying to put my game into a GTK window an few menus.
I did like the SDL+GTK hack example in the libsdl.org demo section.
I get it, my game is now into a GTK window but now I can’t move
the tank (its a tank game).

The SDL_PollEvent isn’t working no more?
Does anybody know how to solve this problem?

Really thanks.