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
renderer.hookControllerLogic(element);
			
			
			if (element instanceof MElementContainer) {
				renderer.processContents((MElementContainer<MUIElement>) element);
			}
			
			renderer.postProcess(element);
			
			if (element.getParent() instanceof MUIElement) {
				MElementContainer<MUIElement> parentElement = element
						.getParent();
				AbstractPartRenderer parentRenderer = getRendererFor(parentElement);
				if (parentRenderer != null)
					parentRenderer.childRendered(parentElement, element);
			}
		} else {
			
			if (element instanceof MContext) {
				MContext ctxt = (MContext) element;
				IEclipseContext lclContext = ctxt.getContext();
				if (lclContext != null) {
					lclContext.dispose();
					ctxt.setContext(null);
				}
			}
		}
		return newWidget;
	}
	private IEclipseContext getContext(MElementContainer<MUIElement> parent) {