[Trinidad] Renderer Listeners

[William Hoover]

I don't suppose there are any event listeners that can detect when components 
are being rendered? It would be nice if there was a way to be able to...

component.addRendererListener(new RendererListener() {
        public void processRenderBegin(RenderEvent event) {
                ...
        }
        public void processRenderEnd(RenderEvent event) {
                ...
        }
});