On view hierarchy, clarification needed - objective-c

Question

In this code example, i am trying to produce the following view hierarchy
Window -> background image -> scroll view -> text view
All i see however is
Window -> background image
What am i missing please?
-(void) viewWillAppear:(BOOL)animated {
UIScrollView *scrollWindow = [[UIScrollView alloc]
initWithFrame:CGRectMake(30, 30, 440, 212)];
UITextView *scrollableText = [[UITextView alloc] init];
[scrollableText setEditable:NO];
[scrollableText setText:#"Why, hello there"];
[scrollWindow addSubview:scrollableText];
UIImage *backgroundImage = [[UIImage alloc] initWithCGImage:
[UIImage imageNamed:#"about_bg.png"].CGImage];
UIImageView *backgroundView = [[UIImageView alloc]
initWithImage:backgroundImage];
[backgroundView addSubview:scrollWindow];
[[self view] addSubview:backgroundView];
}

Answer 1

Andrew is right about not making the scroll view a subview of the background UIImageView view. But the scroll view is invisible. Only its content (scrollableText) will show. And you haven't set scrollableText's frame, so it's effectively invisible too. Init like so:
[scrollableText setEditable:NO];
[scrollableText setText:#"Why, hello there"];
[scrollableText setFrame:CGRectMake(0, 0, 100, 100)];
And you should see it.

Answer 2

What you need is this hierarchy:
Window
background image view
scroll view
text view
Try adding two subviews to your window, not shove them all as subviews into each other.''-
- (void) viewWillAppear:(BOOL)animated {
UIScrollView *scrollWindow = [[UIScrollView alloc] initWithFrame:CGRectMake(30, 30, 440, 212)];
UITextView *scrollableText = [[UITextView alloc] init];
UIImageView *backgroundView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"about_bg.png"]];
scrollableText.editable = NO;
scrollableText.text = #"Why, hello there";
[scrollWindow addSubview:scrollableText];
[self.view addSubview:backgroundView];
[self.view addSubview:scrollWindow];
}