Bug 295611 [UI] The MPart tests leave many open shells
This turns out to be caused by the PRE's 'stop' method only working correctly when an MApplication is the 'uiRoot' element.
bundles/org.eclipse.e4.ui.workbench.swt/src/org/eclipse/e4/ui/workbench/swt/internal/PartRenderingEngine.java
Activator
						.trace(Policy.DEBUG_RENDERER, "visible -> false", null); 
				
				removeGui(changedElement);
			}
		}
	};
	private EventHandler childrenHandler = new EventHandler() {
		public void handleEvent(Event event) {
			MElementContainer<MUIElement> changedElement = (MElementContainer<MUIElement>) event
					.getProperty(IUIEvents.EventTags.Element);
			
			AbstractPartRenderer factory = getFactoryFor(changedElement);
			if (factory == null)
				return;
			String eventType = (String) event
					.getProperty(IUIEvents.EventTags.Type);
			if (IUIEvents.EventTypes.Add.equals(eventType)) {
				Activator.trace(Policy.DEBUG_RENDERER, "Child Added", null); 
				MUIElement added = (MUIElement) event
						.getProperty(IUIEvents.EventTags.NewValue);
				
				
				if (added.getWidget() == null)
					
					createGui(added);
				else {
					factory.childRendered(changedElement, added);
				}
			} else if (IUIEvents.EventTypes.Remove.equals(eventType)) {