public Renderer getRenderer(FacesContext facesContext, String rendererType) {
Renderer renderer = null;
if (rendererType != null) {
ClientPropertiesKey clientKey = ClientPropertiesKey.get(facesContext);
RendererCacheKey cacheKey = new RendererCacheKey(clientKey, rendererType);
renderer = rendererCache.get(cacheKey);
if (renderer != null) {
return renderer;
}