title: Adding a toolbar to INAppStoreWindow
body: <p>I'm trying to add a toolbar to INAppStoreWindow.</p>
  
  <p>It has this property:</p>
  
  <pre><code>/** The title bar view itself. Add subviews to this view that you want to show in
   the title bar (e.g. buttons, a toolbar, etc.). This view can also be set if 
  you want to use a different styled title bar aside from the default one 
  (textured, etc.). **/
  
  @property (nonatomic, retain) NSView *titleBarView;
  </code></pre>
  
  <p>I have a toolbar created, and linked to an outlet in my code, but how can I add it as a subview if it has a class of NSToolbar, when it requires a NSView?</p>
  
  <p>This throws an exception:    <code>[aWindow.titleBarView addSubview:toolbar];</code></p>
  
  <p>Many thanks in advance</p>