title: Adding views or windows to MainWindow
body: <p>I'm stumbling over some basic concepts, that I cannot grasp. I hope, somebody can clear some things up for me, as I've found no resource, that would explain that. OR maybe, it's in the bright open and I just don't see it.</p>
  
  <p>Understood so far: The MainWindow holds the menu and is therefore more or less essential. The <code>info.plist</code> holds the nib, that's loaded on appstart.</p>
  
  <p>Not understood so far: I am trying a single window application. I can do everything in the appDelegate (works fine so far) and I can have an additional controller, to whcih I can connect <code>UIElements</code> from the MainWindow to (works although fine so far). BUT: What I'd really like to do, is have a MainWIndow, that only has the menu, and a separate controller and nib (possibly even more than one of both later on), that are loaded and added subsequently.</p>
  
  <p>My questions:</p>
  
  <ul>
  <li><p>Use <code>NSWindowController</code> or <code>NSViewController</code>? And why? (I'd use <code>NSViewController</code>)</p></li>
  <li><p>What, where and how to instantiate (presumably in the <code>didFinishLaunching</code> of the appDelegate?)</p></li>
  <li><p>How to add window or view to the one and only main-window instead of having a second, independent window (I'm not yet up for multiDocumentApps)</p></li>
  </ul>
  
  <p>Thanx a lot, any thoughts appreciated!</p>