title: Clear example and best approach to NSCollectionView
body: <p>I looked for this on the web, but I could not find any clear tutorial on how to successfully implement an NSCollectionView. How should I proceed? </p>
  
  <p>In Interface Builder, I can drag an NSCollectionView to the main view, and I see that there are two other new views in the documents window: I suppose one is the actual NSView inside the collectionView, and the other one is the NSView prototype for each of the elements that will be displayed inside the collection. </p>
  
  <p>But from now on I don't have any idea about what to do. </p>
  
  <p>Any help would be very appreciated, but thank you anyway in advance.</p>
  
  <p>—Albé</p>