UIImagePickerController strange behavior

Here is a piece of UIImagePickerController source code. The source code is really straight forward. Say, we have a ViewController and in the .m file, we declare the following information:LoadCamera is a function that open the initiates the UIImagePickerController and adds it to the delegate's window. What's wrong with the code? 

-(IBAction)loadCamera:(UIButton *)sender{
     
     PagingScrollViewAppDelegate *appDelegate = (PagingScrollViewAppDelegate *)[[UIApplication sharedApplication] delegate];

     imagePickerController = [[UIImagePickerController alloc] init];
     imagePickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
     
     imagePickerController.delegate = self;
     
     [appDelegate.window addSubview:imagePickerController.view];
 }

Symptoms:

The strange thing occurs when I select an image inside the UIImagePickerController, instead of calling the

- (void)imagePickerController:(UIImagePickerController *)picker 
          didFinishPickingImage:(UIImage *)image
                      editingInfo:(NSDictionary *)editingInfo

it calls the

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker

Answer:

Basically, it is due to the fact that we are adding the UIImagePickerController's view as a subview of the main view.

UIImagePickerController should be presented modally. Else, it gives strange behavior! 

Hope that helps!

UIViewController *viewController = [[[UIViewController alloc] initWithNibName:nil                                    bundle:nil] autorelease];

self.navController = [[[UINavigationController alloc]           

                           initWithRootViewController:viewController] autorelease ];



[appDelegate.window addSubview: [navController view]];

[navController presentModalViewController:myImagePicker animated: YES];