About drawing area's keypress event

[rings <rings etang com>]

Hi:
  Many thanks for everybody's advice.Now,I have a question.I use gtk_widget_set_events() to probe a 
drawing_area's keypress event,but I cann't get it.However I may get a buttonpress event.My codes is these 
below.

//****************************************************************************//
gtk_widget_set_events (GTK_WIDGET(drawing_area), GDK_EXPOSURE_MASK
                         | GDK_BUTTON_PRESS_MASK | GDK_POINTER_MOTION_MASK
                         | GDK_BUTTON_RELEASE_MASK |GDK_KEY_PRESS_MASK | GDK_KEY_RELEASE_MASK);
gtk_signal_connect (GTK_OBJECT (drawing_area), "key_press_event",
                    GTK_SIGNAL_FUNC(KeyPrs_CallBack),NULL);

//****************************************************************************//

If I use window(a Gtk's toplevel window) to replace drawing_area,I may get keypress event.How can I get 
drawing_area's keypress event?

Thanks!
                

            rings
            rings etang com