People want to help. But we can't 'see' your picture'. I don't quite understand either. (thinking on it)
Forbidden Planet
(monster from the ID 1956 movie)
We are Painters / Artists long before we are software designers! A "thing" starts out in our heads as an ID the medical term for idea, but more deeply it means a picture in the mind. Then we begin trying to paint our picture. ID = the part of the mind in which innate instinctive impulses and primary processes are manifest.
First thing that comes to my mind is a TableArrangement with 2 columns and one row with two ListView having one in each column. From that any selected item could be viewed on another screen or "layover" as a singular item.
I attempted to run your aia but it blows up on me Osama. It just blows off the screen 
What I am saying is: Is there another way you can describe your picture?