ng title and, perhaps
    more importantly, an action to perform, by passing a string and an
    action to it. First, let's set the button title:</p>

    <pre>
(let ((label (%make-nsstring "Hello!")))
  (#/setTitle: my-button label)
  (#/release label))
;Compiler warnings :
;   Undeclared free variable MY-BUTTON, in an anonymous lambda form
NIL
    </pre>

    <p>The button changes to display the text "Hello!". Notice that we
    are careful to save a reference to the button text and release it
    after c