title: Mac OS X Autolayout - expand to fill superview
body: <p>I have a nib. It has an <code>NSScrollView</code> with an <code>NSTableView</code> inside it. I would like this tableview to automatically expand to fill its entire superview. </p>
  
  <p>I'm trying to use autolayout but I have no idea how to add the constraints. Since the nib has no view objects other than the scroll view - I don't get how you reference the superview.<br>
  None of the auto layout buttons at the bottom of the nib editor give me any options, everything is grayed out. </p>
  
  <p>I'm using Interface Builder, Xcode 5, OS X 10.9.2.<br>
  Not iOS!</p>