Reply to Mapping for Traktor Scratch Pro 2 - Deck Toggle?

I recently bought a turntable and upgraded my S4 software to the scratch upgrade. I am trying to map a button (or two buttons) on my LPD8 to toggle between decks C and D in the Traktor Scratch software. So that I am able to switch back and forth between decks with ease on one turntable.

Does anyone have such a mapping?

I tried to map it but I am having difficulties with it's execution.