ClientFactory clientFactory = GWT.create(ClientFactory.class);
EventBus eventBus = clientFactory.getEventBus();
PlaceController placeController = clientFactory.getPlaceController();
// Start ActivityManager for the main widget with our ActivityMapper
ActivityMapper activityMapper = new NetmusActivityMapper(clientFactory);
ActivityManager activityManager = new ActivityManager(activityMapper, eventBus);
activityManager.setDisplay(app_widget);
// Start PlaceHistoryHandler with our PlaceHistoryMapper
NetmusPlaceHistoryMapper historyMapper= GWT.create(NetmusPlaceHistoryMapper.class);