this.clientFactory = createClientFactory();
MainUiView mainUiView = clientFactory.getMainUiView();
EventBus eventBus = clientFactory.getEventBus();
ActivityManager manager = new ActivityManager(new ContentAreaActivityMapper(
clientFactory), eventBus);
manager.setDisplay(mainUiView.getContentArea());
PlaceHistoryMapper historyMapper = GWT
.create(SpadgerPlaceHistoryMapper.class);