Set up an EventBox to grab key_press/release events, and they don't get
through.
The code below should print something for button & key events; it only
prints button events.
Possibly I've missed something.


#include <gtkmm.h>
#include <iostream>

class ExampleWindow : public Gtk::Window
{
public:
  ExampleWindow() : m_Label("Click here to quit, quit, quit, quit, quit")
  {
    set_title ("EventBox");
    set_border_width(10);
    add(m_EventBox);
    m_EventBox.add(m_Label);
    m_Label.set_size_request(110, 20);
    m_EventBox.set_events(Gdk::KEY_PRESS_MASK | Gdk::BUTTON_PRESS_MASK);
    m_EventBox.signal_button_press_event().connect(SigC::slot(*this,
&ExampleWindow::on_eventbox_button_press) );
    m_EventBox.signal_key_press_event().connect(SigC::slot(*this,
&ExampleWindow::on_eventbox_key_press) );

    show_all_children();
  }
  virtual ~ExampleWindow() {} ;

protected:
  virtual bool on_eventbox_key_press(GdkEventKey* event)
  {
    std::cout <<"KEY "<<event->keyval<<std::endl;
    return true;
  }
  virtual bool on_eventbox_button_press(GdkEventButton* event)
  {
    std::cout <<"BUTTON"<<std::endl;
    return true;
  }

  Gtk::EventBox m_EventBox;
  Gtk::Label m_Label;
};

int main(int argc, char *argv[])
{
  Gtk::Main kit(argc, argv);
  ExampleWindow window;
  Gtk::Main::run(window);
  return 0;
}