@Override
public void onModuleLoad() {
SplitPanel outer = new SplitPanel(false);
SplitPanel inner = new SplitPanel(true);
Element
e = Browser.getDocument().createDivElement();
e.getStyle().setBackgroundColor("grey");
outer.addChild(e, 0.25);
e = Browser.getDocument().createDivElement();
e.getStyle().setBackgroundColor("yellow");
inner.addChild(e, 0.25);
e = Browser.getDocument().createDivElement();
e.getStyle().setBackgroundColor("red");
inner.addChild(e, 0.25);
e = Browser.getDocument().createDivElement();
e.getStyle().setBackgroundColor("blue");
inner.addChild(e, 0.25);
e = Browser.getDocument().createDivElement();
e.getStyle().setBackgroundColor("green");
inner.addChild(e, 0.25);
outer.addChild(inner.getElement(), 0.5);
e = Browser.getDocument().createDivElement();
e.getStyle().setBackgroundColor("cyan");
outer.addChild(e, 0.25);
Browser.getDocument().getElementById("gwt_root").appendChild(inner.getElement());
}