title: UIButton behind UIScrollView
body: <p>I have a UIButton behind a UIScrollView. The scroll's background is transparent and the button is in the lower right corner. So it is visible.</p>
  
  <p>The problem is that the UIButton does not respond to any touch events when it is below the scroll. What would it require to make it respond to touch events in this scenario? </p>
  
  <p>Thank you</p>