 its size and position. We can once again
    use <code>ns:with-ns-rect</code> to specify a temporary rectangle
    for the purpose of initializing our button:</p>

    <pre>
(ns:with-ns-rect (frame 10 10 72 32)
  (#/initWithFrame: my-button frame)
  (#/setButtonType: my-button #$NSMomentaryPushInButton)
  (#/setImagePosition: my-button #$NSNoImage)
  (#/setBezelStyle: my-button #$NSRoundedBezelStyle))
;Compiler warnings :
;   Undeclared free variable MY-BUTTON (4 references), in an anonymous lambda form
NI