title: UITableViewCell setEditing is not called
body: <p>I have <code>UIViewController</code> that contains <code>UITableView</code>. I implemented my custom edit button that toggles <code>setEditing:animated</code> for the table view. Everything works good, delete and reordering icons show up. Table view cells has custom class (subclass of <code>UITableViewCell</code>), where I override <code>setEditing</code> method to do some extra customisation when edit mode is ON. </p>
  
  <p>From documentation: </p>
  
  <blockquote>
    <p>When the table view receives setEditing:animated:, it sends the same
    message to the UITableViewCell object for each visible row.</p>
  </blockquote>
  
  <p>As I understand <code>setEditing</code> method should be called for every cell, but unfortunately it does not happen. Where could be the problem? What I am missing? </p>