updateUI(new RequestHandler() {
@Override
public void onRequest() {
final PElement ul1 = new PElement("ul");
ul1.ensureDebugId("ul1");
final PElement li1 = new PElement("li");
li1.setInnerText("1rst element");
final PElement li2 = new PElement("li");
li2.setInnerHTML("<font color='red'>2d</font> element");
final PLabel label1 = new PLabel("A widget");