title: Tabs feature in macOs for not document-based apps
body: <p>In Xcode 8 under macOs Sierra it is possible to create a document-based app and it automatically is capable of showing different opened documents in tabs just as Safari or Xcode itself did prior to macOs Sierra. Now, I like to know if I can use this in a different context as well. Imagine an App where the user can load a book from a dropdown menu. I like the chapters of that book be selectable via a tab view. A standard NSTabView however does not look as nice as the one I mentioned earlier, so that is not an option.</p>