title: Get child view from ContainerView
body: <p>I have a <code>ViewController</code> with two overlapping <code>ContainerViews</code>.
  <a href="https://i.stack.imgur.com/PpPp8.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/PpPp8.png" alt="enter image description here"></a></p>
  
  <p>But i didn't find method how in <code>RootViewController</code> get child from <code>ContainerView</code>.</p>