title: dismiss nsviewcontroller swift doesn't work
body: <p>That's the button action:</p>
  
  <pre><code>    @IBAction func readyPressed(sender: NSButton) {
  
      self.dismissController(Hardness)
      println(1)
      self.performSegueWithIdentifier("manual", sender: self)
      }
  </code></pre>
  
  <p>When I press the button, println works, segue works, but NSViewController "Hardness" doesn't close</p>