title: Enter a rightview UIImageView to a UITextField
body: <p>I have a target action that when a button is pressed, I validate the <code>UITextField</code>:</p>
  
  <pre><code>// Get the text from the UITextField
  NSString *nameStr = _name.text;
  
  _name.rightView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"error.png"]];
  [self.view addSubview:_name];
  
  if (nameStr.length == 0)
  {
      UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Invalid Name"
                                                      message:@"You must enter a name."
                                                 delegate:nil
                                            cancelButtonTitle:@"OK"
                                            otherButtonTitles:nil];
      [alert show];
  }
  </code></pre>
  
  <p>My <code>UITextField</code> are added to the view in <code>viewDidLoad</code> like so:</p>
  
  <pre><code>[self.view addSubview:_name];
  </code></pre>
  
  <p>How do I make a rightView <code>UIImageView</code> appear?</p>