navContent = body.one("#nav>.content");
navContent.setStyle("border", "4px solid pink");
mainContent = body.one("#main>.content");
mainContent.getDOMNode().setId("main-example-panel");
extraContent = body.one("#extra>.content");
footer = body.one("#ft");
Y.newButton(ButtonConfig.create().label("search1").
on("click", new EventCallback<ButtonEvent>() {
@Override
public void call(ButtonEvent e) {