title: Add UIDatePicker to UIAlertView
body: <p>I am trying to add a date picker to an alert view.  I can add the animation to the screen based on a button click and I see a black box but no date picker.</p>
  
  <p>Here is what I have so far....</p>
  
  <pre><code>- (IBAction)showDatePicker {
      CGRect frame = CGRectMake(200, self.view.frame.size.height, self.view.frame.size.width, 0);  //CGRectMake(225, 145, 260, 125);
      UIPickerView *datePicker = [[UIPickerView alloc] initWithFrame:frame];
      UIAlertView *showDateAlert = [[UIAlertView alloc]
                                    initWithTitle:@"Enter the Code Date"
                                    message:@"Sample message"
                                    delegate:self
                                    cancelButtonTitle:@"Cancel"
                                    otherButtonTitles:@"Update", nil];
  
      [self.view addSubview:datePicker];
      [UIView beginAnimations:@"slideIn" context:nil];
      [datePicker setCenter:CGPointMake(datePicker.frame.origin.x, self.view.frame.size.height - datePicker.frame.size.height/2)];
      [UIView commitAnimations];
  }
  </code></pre>
  
  <p>I found an example that appears to be working BUT I don't see any dialog or buttons in my alert box, just the date picker itself.  Am I missing something here?</p>
  
  <pre><code>- (IBAction)showDatePicker {
      CGRect frame = CGRectMake(225, self.view.frame.size.height, self.view.frame.size.width, 125);
      UIDatePicker *datePicker = [[UIDatePicker alloc] initWithFrame:frame];
      datePicker = [[UIDatePicker alloc] init];
      datePicker.datePickerMode = UIDatePickerModeDate;
  
      [datePicker setDate:[NSDate date]];
  
      UIAlertView *alert;
      alert = [[UIAlertView alloc]
               initWithTitle:@"Enter the Code Date"
               message:@"Sample message"
               delegate:self
               cancelButtonTitle:@"Cancel"
               otherButtonTitles:@"Update", nil];
      alert.delegate = self;
      [alert addSubview:datePicker];
      [alert show];
  }
  </code></pre>