AmigaOS 3.3 Settings like GUI Question

I am looking to replicate some of the new OS 3.3 Settings GUI and I have a few questions.

It looks like the left side is a list browser with the different options in a box separator. (Possibly scroll bars if needed).
The Right side I am thinking is removing then adding the Child Group based on what item in the list browser was clicked on?

Well that's the road I am starting down and thought I would ask if I am making this harder than is needed or there is some other magic?

Thank you.