title: How to scroll a UIScrollView containing a UIView?
body: <pre><code>UIView * blueView = [[UIView alloc] initWithFrame:CGRectMake(10, 10, 100, 100)];
  blueView.backgroundColor = [UIColor blueColor];
  [scrollView addSubview:blueView];
  scrollView.contentSize = CGSizeMake(1500, 2000);
  </code></pre>
  
  <p>I can drag-scroll in most of scrollView just fine, but dragging when the touch starts in blueView doesn't work.</p>
  
  <p>How can touches that start within the UIView (blueView in this case) scroll the UIScrollView?</p>
  
  <p>blueView is not first responder, blueView's next responder is scrollView, etc.</p>
  
  <p>Seems pretty basic, but I'm stuck for a while now.  What am I missing?  thx.</p>