title: How to show UIToolBar at bottom of UIView after pop to root of UINavigationController?
body: <p>I can't show a UIToolbar that was at the bottom of a view, where the view pushed a navigation controller and then popped back to the view using the back button.</p>
  
  <p>In a NIB I've created:</p>
  
  <pre><code>UIViewController RootViewController containing a
     UIView  containing a
         UIToolbar at bottom of UIView
  </code></pre>
  
  <p>In RootViewController I create next UIViewController, NextViewController, within which I create a NavigationController:</p>
  
  <pre><code>UIViewController RootViewController containing a
     UIViewController NextViewController containing a 
        NavigationController
  </code></pre>
  
  <p>In NextViewController I can see the UIToolbar from RootViewController.  When I pop back to NextViewController, using the back button, from the NavigationController I can no longer see the UIToolbar from RootViewController.  Does anyone know how to make the UIToolbar visible?</p>
  
  <p>One approach I thought would work was to get a pointer to the UIToolbar and add it as a subview to the navigation controller as:</p>
  
  <pre><code>AppDelegate *appDelegate    = [[UIApplication sharedApplication] delegate];
  RootViewController *rootViewController = appDelegate.rootViewController;
  
  UIView *rootViewUIView               = rootViewController.view;
  UIToolbar *rootViewUIToolbar         = rootViewUIView.toolbar;
  
  [self.navigationController.view addSubview:rootViewUIToolbar];
  </code></pre>
  
  <p>But I get the error: "Request for member rootViewUIToolbar in something not a structure or a union" for the line:</p>
  
  <pre><code>UIToolbar *rootViewUIToolbar         = rootViewUIView.toolbar;
  </code></pre>
  
  <p>Any ideas on how to show the toolbar after popping back to the root view from the navigation controller using the back button?</p>