Bug 314317 Cannot re-create a previously closed MWindow instance
bundles/org.eclipse.e4.ui.workbench.renderers.swt/src/org/eclipse/e4/workbench/ui/renderers/swt/WBWRenderer.java
parent.getTags().add("active"); 
				setCSSInfo(parent, parent.getWidget());
			} else {
				setCSSInfo(activePart, activePart.getWidget());
			}
		}
	}
	@PostConstruct
	public void init() {
		shellUpdater = new EventHandler() {
			public void handleEvent(Event event) {
				
				Object objElement = event
						.getProperty(UIEvents.EventTags.ELEMENT);
				if (!(event.getProperty(UIEvents.EventTags.ELEMENT) instanceof MWindow))
					return;
				
				MWindow windowModel = (MWindow) objElement;
				if (windowModel.getRenderer() != WBWRenderer.this)
					return;
				
				Shell theShell = (Shell) windowModel.getWidget();
				if (theShell == null)
					return;
				String attName = (String) event
						.getProperty(UIEvents.EventTags.ATTNAME);
				if (UIEvents.UILabel.LABEL.equals(attName)) {
					String newTitle = (String) event
							.getProperty(UIEvents.EventTags.NEW_VALUE);
					theShell.setText(newTitle);