old_contents: function alertClicked() {
    alert('You clicked the third ListGroupItem');
  }
  
  render(
    <ListGroup defaultActiveKey="#link1">
      <ListGroup.Item action href="#link1">
        Link 1
      </ListGroup.Item>
      <ListGroup.Item action href="#link2" disabled>
        Link 2
      </ListGroup.Item>
      <ListGroup.Item action>This one is a button</ListGroup.Item>
    </ListGroup>,
  );
  
new_contents: function alertClicked() {
    alert('You clicked the third ListGroupItem');
  }
  
  render(
    <ListGroup defaultActiveKey="#link1">
      <ListGroup.Item action href="#link1">
        Link 1
      </ListGroup.Item>
      <ListGroup.Item action href="#link2" disabled>
        Link 2
      </ListGroup.Item>
      <ListGroup.Item action onClick={alertClicked}>
        This one is a button
      </ListGroup.Item>
    </ListGroup>,
  );
  
subject: fix ListGroup/Linked example (#3581)