Session Box + Scene Navigation

I have a 1 x 4 session box and am looking to also have it select the current scene it is on whenever I use the session box navigation buttons I have mapped to go up/down respectively. So if I move the session box down, the highlighted scene should follow along with the session box.

I am pretty sure I can accomplish this using reactions but am having a tough time finding the right LOM syntax to set the selected scene to where the session box is currently located. Is this possible?

Any help is greatly appreciated!

Ed