key release events

[Ray Haleblian <rayh infohouse com>]

i'm new to GTK. i modified the hello world example to examine how key
presses and releases are handled. however, i don't appear to get key
release events. i there a special initialization? i use

  /* need a mode to produce key release events? */
  gtk_signal_connect (GTK_OBJECT (window), "key_press_event",
        GTK_SIGNAL_FUNC (keydown), NULL);
  gtk_signal_connect (GTK_OBJECT (window), "key_release_event",
        GTK_SIGNAL_FUNC (keyup), NULL);

i get calls to 'keydown' but not 'keyup'...

thanks