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 (element instanceof MContext) {
			MContext ctxt = (MContext) element;
			
			
			if (ctxt.getContext() == null) {
				IEclipseContext lclContext = parentContext
						.createChild(getContextName(element));
				populateModelInterfaces(ctxt, lclContext, element.getClass()
						.getInterfaces());
				ctxt.setContext(lclContext);
				
				
				
				
				for (String variable : ctxt.getVariables()) {
					lclContext.declareModifiable(variable);
				}
				Map<String, String> props = ctxt.getProperties();
				for (String key : props.keySet()) {
					lclContext.set(key, props.get(key));
				}
				E4Workbench.processHierarchy(element);
			}
		}
		
		Object newWidget = createWidget(element, parentWidget);
		
		if (newWidget != null) {
			AbstractPartRenderer renderer = getRendererFor(element);