Layer UIViews so bottom-most can be seen

[joec]

Hi

I have a view that i set the background image of. To that view, i add a scrollview and to the scrollview, i add another view (called ButtonView), which contains some UIButtons.

I would like to be able to set the transparency correct so that i can see the background image of the bottom view, in the gaps between my UIButtons.

So, i have set the following:

In ButtonViewController:
self.view.backgroundColor = [UIColor clearColor];
self.view.opaque = NO;

In ScrollViewController (also root controller):
self.view.backgroundColor = [UIColor colorWithPatternImage.....];
self.scrollView.backgroundColor = [UIColor clearColor];
self.scrollView.opaque = NO;

I can see my background image correctly surrounding my scrollview, but underneath and between the buttons is just black.

What else do i need to set?

Thanks a lot
Joe.