ActivityManager northActivityManager = new ActivityManager(northActivityMapper, eventBus);
northActivityManager.setDisplay(northDisplay);
// Start CenterActivityManager for the center widget with the
// CenterActivityMapper
ActivityMapper centerActivityMapper = new CenterActivityMapper(clientFactory);
ActivityManager centerActivityManager = new ActivityManager(centerActivityMapper, eventBus);
centerActivityManager.setDisplay(centerDisplay);
// Start WestActivityManager for the west widget with the
// WestActivityMapper