code: private void makeSimpleExample() {
  		add(new WHeading(HeadingLevel.H3, "Simple WRadioButtonSelect"));
  		WPanel examplePanel = new WPanel();
  		examplePanel.setLayout(new FlowLayout(FlowLayout.VERTICAL, Size.MEDIUM));
  		add(examplePanel);
  
  		/**
  		 * The radio button select.
  		 */
  		final WRadioButtonSelect rbSelect = new WRadioButtonSelect("australian_state");
  		final WTextField text = new WTextField();
  
  		text.setReadOnly(true);
  		text.setText(NO_SELECTION);
  
  		WButton update = new WButton("Update");
  		update.setAction(new Action() {
  			@Override
  			public void execute(final ActionEvent event) {
  				text.setText("The selected item is: "
  						+ rbSelect.getSelected());
  			}
  		});
  		//setting the default submit button improves usability. It can be set on a WPanel or the WRadioButtonSelect directly
  		examplePanel.setDefaultSubmitButton(update);
  
  		examplePanel.add(new WLabel("Select a state or territory", rbSelect));
  		examplePanel.add(rbSelect);
  		examplePanel.add(text);
  		examplePanel.add(update);
  		add(new WAjaxControl(update, text));
  	}
docs: Make a simple editable example. The label for this example is used to get the example for use in the unit tests.