events do NOT respond :S

[HeavyJoost <heavyjoost gmail com>]

For some reason events are not received by my program, while I think it 
should.
I use this piece of code:
  buttonBack.set_events(Gdk::ALL_EVENTS_MASK);
  
buttonBack.signal_button_press_event().connect(sigc::mem_fun(*this,&MainWindow::BackClick));

Where buttonBack is a Gtk::Button. Bool 
MainWindow::BackClick(GdkEventButton* event) is a simple function that 
shows some message like "hello" using std::cout.
What is wrong with my code?