Bug 334644 Cannot manually un/render a window that's directly under the application
Setting the 'toBeRendered' flag for a window that's a direct child of an application does nothing. The workaround is to manually de/construct it via the IPresentationEngine.
bundles/org.eclipse.e4.ui.workbench.swt/src/org/eclipse/e4/ui/internal/workbench/swt/PartRenderingEngine.java
context);
		} catch (Exception e) {
			logger.warn(e, "Could not create rendering factory");
		}
		
		if (factory == null) {
			try {
				factory = (IRendererFactory) contribFactory.create(
						defaultFactoryUrl, context);
			} catch (Exception e) {
				logger.error(e, "Could not create default rendering factory");
			}
		}
		if (factory == null) {
			throw new IllegalStateException(
					"Could not create any rendering factory. Aborting ...");
		}
		curFactory = factory;
		context.set(IRendererFactory.class, curFactory);
		
		if (eventBroker != null) {
			eventBroker.subscribe(UIEvents.buildTopic(UIEvents.UIElement.TOPIC,
					UIEvents.UIElement.TOBERENDERED), toBeRenderedHandler);
			eventBroker.subscribe(UIEvents.buildTopic(UIEvents.UIElement.TOPIC,
					UIEvents.UIElement.VISIBLE), visibilityHandler);
			eventBroker.subscribe(UIEvents.buildTopic(
					UIEvents.ElementContainer.TOPIC,
					UIEvents.ElementContainer.CHILDREN), childrenHandler);
			eventBroker.subscribe(UIEvents.buildTopic(
					UIEvents.TrimmedWindow.TOPIC,