How to create a selection sequence?

Hi Guys, I would like to understand how I can create a sequence of selection, something similar to that in this video
[link text][1]

My Sequence:

Using the shoulder buttons of my gamepad for to switch the selection, I tried to use the “MultiGate”, “Sequence”, “FlipFlop” etc. but without success. By simplifying when I press the Shoulder button the first time I select the first character, when I press it again must select the one after (obviously needs to close the first selection).
Surely it is a simple thing but I’m stuck :frowning:
Thx.