title: Detect touches on sublayer elements
body: <p>I have MyCustomView view as subclass of the UIControl class.
  I draw stuff on my view like this:</p>
  
  <pre><code>   CAShapeLayer *line = [CAShapeLayer layer];
     ....
     [self.layer addSublayer:line];
  </code></pre>
  
  <p>Is it anyway to detect touches on 'line' and do some work? For example move 'line'.</p>