EventBus eventBus = clientFactory.getEventBus();
PlaceController placeController = clientFactory.getPlaceController();
// Start NorthActivityManager for the north widget with the
// NorthActivityMapper
ActivityMapper northActivityMapper = new NorthActivityMapper(clientFactory);
ActivityManager northActivityManager = new ActivityManager(northActivityMapper, eventBus);
northActivityManager.setDisplay(northDisplay);
// Start CenterActivityManager for the center widget with the
// CenterActivityMapper