title: How to add custom views to the NSSplitView divider
body: <p>What is the preferred approach to add custom views to the divider of a NSSplitView?</p>
  
  <p>Taken the divider XCode uses to separate the CodeView and the Debug-OutputView, how do i add custom controls / views to the divider? Do i have to create a view and handle the drag operations myself or is it possible to customize the divider?</p>
  
  <p>thank you</p>