Why doesn't my UIView remain transparent after it finishes loading?

I have a view being displayed modally and, before I display it, I set it's background color to transparent...

- (void)viewDidAppear:(BOOL)animated
{
 [super viewDidAppear:animated];

 MyViewController_iPhone *myVC = [[MyViewController_iPhone alloc] initWithNibName:@"MyView" bundle:nil];
 [myVC.view setBackgroundColor:[UIColor colorWithRed:0 green:0 blue:0 alpha:0.0]]
 [[self navigationController] presentModalViewController:myVC animated:YES];
 [myVC release];
}

As the view animates up onto the screen, the background is transparent, but as soon as it finishes animating upward, the view's background goes back to开发者_C百科 the original opaque white color, why?

Thanks in advance for your help!

According to this post Transparent Background with a Modal UIViewController it cannot be done. What are you trying to end up with?

This link seems to describe what you're trying to achieve. http://doganberktas.com/2010/05/18/adding-transparent-modal-view-programatically-iphone/