L
    </pre>

    <p>Now we just need to add the button to the window. This we do by
    asking the window for its content view, and asking that view to
    add the button as a subview:</p>

    <pre>
(#/addSubview: (#/contentView my-window) my-button)
    </pre>

    <p>The button appears in the window with the rather uninspired
    title "Button". Clicking it highlights the button but, since we
    didn't give it any action to perform, does nothing else.</p>

    <p>We can give the button a more interesti