OSX Swift - Show modal second window
<p>I am trying to display a second window after a button click:</p>

<pre><code>var winJ:WinJo // other window NSViewController

@IBAction func BtnNewWin(sender: AnyObject) {
    winJ = WinJo()
    winJ.showWindow(self)
}
</code></pre>

<p>This works fine but I want the new window to be modal. I accomplished this with the Xcode designer but I couldn't figure out how to do this in code.</p>