Bug 317702 ToolItemRenderer needs to consider menus for dropdown tool items
The instantiated ToolItem does have the correct SWT.DROP_DOWN style but clicking on it does nothing.
bundles/org.eclipse.e4.ui.workbench.renderers.swt/src/org/eclipse/e4/ui/workbench/renderers/swt/ToolItemRenderer.java
if (!(event.getProperty(UIEvents.EventTags.ELEMENT) instanceof MToolItem))
				return;
			MToolItem itemModel = (MToolItem) event
					.getProperty(UIEvents.EventTags.ELEMENT);
			ToolItem toolItem = (ToolItem) itemModel.getWidget();
			if (toolItem != null) {
				toolItem.setEnabled(itemModel.isEnabled());
			}
		}
	};
	@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