IB design controls of UIScrollView

I have a UIViewController in it a UIView. I wish to create the following design in IB: place a UIScrollView(Gray area) that will take 3/4 of the UIView (Blue area)

in the designer I have more controls than the gray area (scrollView) can hold using the space it takes on screen (the yellow and red controls)

I was wondering how can I place the yellow and red controls in IB to be part of the scrollView & when running the app make the scrollView actually scroll.