title: UIView not autoresizing subview
body: <p>I have a UIView <code>a</code> that has <code>autoresizing subviews</code> enabled. It's size is:</p>
  
  <pre><code> &lt;UIView: 0x7650180; frame = (0 0; 320 394); clipsToBounds = YES; autoresize = LM+RM+H; layer = &lt;CALayer: 0x7650230&gt;&gt;
  </code></pre>
  
  <p>I have another UIView <code>b</code> which i added to the view <code>a</code>. View <code>b</code> has flexible width/height. When I add it in, I expect it's height to change to <code>394</code>, but it remains the same as the in the nib (<code>420</code>):</p>
  
  <pre><code>&lt;UIView: 0x764f720; frame = (0 0; 320 460); autoresize = LM+W+RM+TM+H+BM; layer = &lt;CALayer: 0x764f320&gt;&gt;
  </code></pre>
  
  <p>What am I doing wrong?</p>
  
  <p>Thanks</p>