title: Setting value for title of NSOpenPanel does not work
body: <p>I want to set title for my NSOpenPanel, but it does not work! Apple says:</p>
  <blockquote>
  <p>Gets and sets the title for the panel shown at the top of the window.</p>
  </blockquote>
  <p>But I can not make codes works, not sure what is wrong?</p>
  <pre><code>let nsOpenPanel = NSOpenPanel()
      nsOpenPanel.canChooseFiles = true
      nsOpenPanel.title = &quot;Hello, Choose Files&quot;
  
     if (nsOpenPanel.runModal() == .OK) ... // rest of codes ...
  </code></pre>