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
if (changedElement.isVisible()
					&& changedElement.getWidget() instanceof Control) {
				
				
				Composite realComp = (Composite) renderer
						.getUIContainer(changedElement);
				Control ctrl = (Control) changedElement.getWidget();
				ctrl.setParent(realComp);
				fixZOrder(changedElement);
				renderer.childRendered(parent, changedElement);
			} else {
				
				if (changedElement.getWidget() instanceof Control) {
					Control ctrl = (Control) changedElement.getWidget();
					ctrl.setParent(getLimboShell());
				}
				renderer.hideChild(parent, changedElement);
			}
		}
	};
	private EventHandler trimHandler = new EventHandler() {
		public void handleEvent(Event event) {
			Object changedObj = event.getProperty(UIEvents.EventTags.ELEMENT);
			if (!(changedObj instanceof MTrimmedWindow))
				return;
			MTrimmedWindow window = (MTrimmedWindow) changedObj;
			if (window.getWidget() == null)
				return;
			String eventType = (String) event
					.getProperty(UIEvents.EventTags.TYPE);