public ImmediateActionRenderResponseFilter(Request request,
    PageResponseRenderer renderer,
    Response response) 
{
        this.request = request;
        this.renderer = renderer;
        this.response = response;
}

 public  void handle(ComponentEventRequestParameters parameters,
    ComponentEventRequestHandler handler) throws IOException 
{
        handler.handle(parameters);
        // If markup or a redirect has already been generated, then we're good.
        if (response.isCommitted()) return;
        // Otherwise, we should be operating in immediate mode.  Figure out which page
        // was selected to render.
        Page page = (Page) request.getAttribute(InternalConstants.IMMEDIATE_RESPONSE_PAGE_ATTRIBUTE);
        if (page != null)
        {
            // We don't have a context to provide but this still nags me as not the right thing to do.
            page.getRootElement().triggerEvent(EventConstants.ACTIVATE, new Object[0], null);
            renderer.renderPageResponse(page);
            return;
        }
        throw new IllegalStateException(
                "Sanity check - neither a stream response nor a redirect response was generated for this action request.");
}