public static void fadeOutAndDispose(final Window window,
      int fadeOutDuration) {
   Timeline dispose = new Timeline(window);
   dispose.addPropertyToInterpolate("opacity", 1.0f, 0.0f);
   dispose.addCallback(new UIThreadTimelineCallbackAdapter() {
      @Override
      public void onTimelineStateChanged(TimelineState oldState,
            TimelineState newState, float durationFraction,
            float timelinePosition) {
         if (newState == TimelineState.DONE) {
            window.dispose();
         }
      }
   });
   dispose.setDuration(fadeOutDuration);
   dispose.play();
}