title: How to detect scrolling for NSOutlineView?
body: <p>I've two NSOutlineViews shown side by side they contain the same number of rows (this is a prerequisite) and I need to synchronize them when user scrolls using mouse, keyboard or scrollbars so I see the same view portion (or rows).</p>
  
  <p>I'm a newbie in the Cocoa land and I'm unable to find how this can be accomplished</p>