[maemo-developers] how to catch mouse event in maemoMM?

[From: chunlong yu]

I write such code in maemo:

MyWindow::MyWindow(void)
{
  signal_button_press_event().connect(sigc::mem_fun(*this,
&MyWindow::on_button_press_event),false);
  signal_button_release_event().connect(sigc::mem_fun(*this,
&MyWindow::on_button_release_event),false);
}
bool  MyWindow::on_button_press_event (GdkEventButton* event)
{
  ....................
  return true;
}

bool  MyWindow::on_button_release_event(GdkEventButton* event)
{
    ...........................
       return true;
}

but I can't catch mouse press and release event, why?
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