Problem with verriding default signal_button_press_handler

[Spo1ler <splrdhc gmail com>]

Hi everybody! I'm writing a simple game. But I've faced with problem, thet my signal handler didn't get control. It's never called!
I've done as your tutorial sais.

Signal Handler sequence

By default, your signal handlers are called after any previously-connected signal handlers. However, this can be a problem with the X Event signals. For instance, the existing signal handlers, or the default signal handler, might return true to stop other signal handlers from being called. To specify that your signal handler should be called before the other signal handlers, so that will always be called, you can specify false for the optional after parameter. For instance,

button.signal_button_press_event().connect( sigc::ptr_fun(&on_mywindow_button_press), false );

This is how I override this signal:

signal_button_press_event().connect(sigc::mem_fun(this, &FieldView::on_button_press), false);

But it didn't work! What am I doing wrong?