Bug 299554 Application.xmi without Window
bundles/org.eclipse.e4.ui.workbench.swt/src/org/eclipse/e4/ui/workbench/swt/internal/PartRenderingEngine.java
Activator.trace(Policy.DEBUG_RENDERER, "Child Removed", null); 
				MUIElement removed = (MUIElement) event
						.getProperty(UIEvents.EventTags.OLD_VALUE);
				
				
				if (!removed.isToBeRendered())
					return;
				if (factory != null)
					factory.hideChild(changedElement, removed);
			}
		}
	};
	private IEclipseContext appContext;
	protected Shell testShell;
	protected MApplication theApp;
	public PartRenderingEngine() {
	}
	public PartRenderingEngine(String curFactoryId) {
		this.curFactoryId = curFactoryId;
	}
	/**
	 * Initialize a part renderer from the extension point.
	 * 
	 * @param registry
	 *            the registry for the EP
	 * @param r
	 *            the created renderer
	 * @param context
	 *            the context for the part factories
	 * @param f