title: how to "bypass" touch events in Cocoa-touch?
body: <p>I want to make a transparent mask-view over the current window, which just tracks touch events and passing them to the visible views below. However if I set userInteractionEnabled=YES to this mask, this blocks the events and won't be passed below.</p>
  
  <p>Is there any way that I can prevent this view from blocking the events, or manually passing the events below?</p>
  
  <p>Thanks,</p>