title: viewWillAppear method not being called after popToRootViewController
body: <p>I have a view controller,that is a <code>UINavigationController</code>, that at some point pushes (<code>navigationcontroller pushViewController: animated:</code>) a second view that later pushes a third view where I have a button that pops back to the root view (<code>popToRootViewController: animated:</code>). The problem is that  after the view is poped back to the root one, the method <code>viewWillApper</code> of the root view is not being called. I've set some breakpoints to check it and it's just not passing through it. I have a method to reload some contents of my root view placed in the <code>viewWillApper</code> and its being completely passed  by after the <code>popToRootViewController: animated</code>.
  Any idea of what's going on?</p>
  
  <p>Thanks</p>