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.
tests/org.eclipse.e4.ui.tests/src/org/eclipse/e4/ui/tests/workbench/PartRenderingEngineTests.java
container.getChildren().add(partC);
		wb = new E4Workbench(application, appContext);
		wb.createAndRunUI(window);
		
		
		container.setSelectedElement(partA);
		container.getChildren().remove(partB);
		assertTrue(
				"Changing the parent of a non-selected element should not change the value of the container's seletedElement",
				container.getSelectedElement() == partA);
		
		
		container.setSelectedElement(partA);
		container.getChildren().remove(partA);
		assertTrue(
				"Changing the parent of the selected element should have set the field to null",
				container.getSelectedElement() == null);
	}
	public void testCreateGuiBug301950() {
		MApplication application = ApplicationFactoryImpl.eINSTANCE
				.createApplication();
		final MWindow window = BasicFactoryImpl.eINSTANCE.createWindow();
		application.getChildren().add(window);
		application.setContext(appContext);
		appContext.set(MApplication.class.getName(), application);
		wb = new E4Workbench(application, appContext);
		wb.createAndRunUI(window);
		MPart part = BasicFactoryImpl.eINSTANCE.createPart();
		part.setContributionURI("platform:/plugin/org.eclipse.e4.ui.tests/org.eclipse.e4.ui.tests.workbench.SampleView");
		window.getChildren().add(part);