title: Resizing NSWindow to match view controller size in storyboard
body: <p>I am working on Xcode 6.1.1 on OSX 10.10. I am trying out storyboards for Mac apps. I have a NSTabViewController using the new <code>NSTabViewControllerTabStyleToolbar</code> <code>tabStyle</code> and it is set as the default view controller for the window controller. <strong>How do I make my window resize according to the current selected view controller?</strong>  </p>
  
  <p>Is it possible to do entirely in Interface Builder?
  Here is what my storyboard looks like:
  <img src="https://i.stack.imgur.com/OC7NF.png" alt="storyboard"></p>