title: drawRect over subviews?
body: <p>I created a container view that holds a bunch of child views - a collection view, a custom toolbar and some bits and pieces. </p>
  
  <p>The design has a border on the top, left and right sides, but not the bottom, so I overrode drawRect to include border.</p>
  
  <p>When I added the toolbar I noticed that it appears over the top of the border. (For some reason I initially thought it wouldn't but of course it does!). </p>
  
  <p><em><strong>Is there anyway I can tell drawRect to draw over the top of my subviews?</em></strong> </p>
  
  <p>Of course there's loads of other ways to solve my problem (adjust the toolbar's frame for example) however I'm asking this question in order to get a deep understanding of how drawing works in relation to compositing and the view hierarchy. </p>