Bug 330699 [Compatibility] Toolbar drop downs do not appear
Toolbar drop downs in the workbench window like search, new class, run/debug all don't show up.
bundles/org.eclipse.e4.ui.workbench.renderers.swt/src/org/eclipse/e4/ui/workbench/renderers/swt/ToolItemRenderer.java
@PostConstruct
	public void init() {
		eventBroker.subscribe(UIEvents.buildTopic(UIEvents.UILabel.TOPIC),
				itemUpdater);
		eventBroker.subscribe(UIEvents.buildTopic(UIEvents.Item.TOPIC,
				UIEvents.Item.SELECTED), selectionUpdater);
		eventBroker
				.subscribe(UIEvents.buildTopic(UIEvents.Item.TOPIC,
						UIEvents.Item.ENABLED), enabledUpdater);
	}
	@PreDestroy
	public void contextDisposed() {
		eventBroker.unsubscribe(itemUpdater);
		eventBroker.unsubscribe(selectionUpdater);
		eventBroker.unsubscribe(enabledUpdater);
	}
	private ParameterizedCommand generateParameterizedCommand(
			final MHandledItem item, final IEclipseContext lclContext) {
		ECommandService cmdService = (ECommandService) lclContext
				.get(ECommandService.class.getName());
		Map<String, Object> parameters = null;
		List<MParameter> modelParms = item.getParameters();
		if (modelParms != null && !modelParms.isEmpty()) {
			parameters = new HashMap<String, Object>();
			for (MParameter mParm : modelParms) {
				parameters.put(mParm.getName(), mParm.getValue());
			}
		}
		ParameterizedCommand cmd = cmdService.createCommand(item.getCommand()
				.getElementId(), parameters);