MarkupContainer r = new R(), s = new S();
Panel innerPanel = new InnerPanel("inner");
innerPanel.queue(s);
Panel outerPanel = new OuterPanel("outer");
outerPanel.queue(r, innerPanel);
TestPage p = new TestPage();
p.setPageMarkup("<html><head></head><body><p wicket:id='outer'></p></body></html>");
p.queue(outerPanel);