code: private void addExample(final String heading, final ListLayout layout) {
  		add(new WHeading(HeadingLevel.H2, heading));
  		WPanel panel = new WPanel();
  		panel.setLayout(layout);
  		add(panel);
  		for (String item : EXAMPLE_ITEMS) {
  			panel.add(new WText(item));
  		}
  		add(new WHorizontalRule());
  	}
docs: Adds an example to the set of examples.
  
  @param heading the heading for the example
  @param layout the layout for the panel