ActivityManager centerActivityManager = new ActivityManager(centerActivityMapper, eventBus);
centerActivityManager.setDisplay(centerDisplay);
// Start WestActivityManager for the west widget with the
// WestActivityMapper
ActivityMapper westActivityMapper = new WestActivityMapper(clientFactory);
ActivityManager westActivityManager = new ActivityManager(westActivityMapper, eventBus);
westActivityManager.setDisplay(westDisplay);
// Start PlaceHistoryHandler with our PlaceHistoryMapper
AppPlaceHistoryMapper historyMapper = GWT.create(AppPlaceHistoryMapper.class);