Microsoft MCE Windows Button

Ive been through the wiki and looked at various related websites and videos but cant seem to figure out how to map the windows button (big green one in the middle of the mce remote) to the Kodi home screen. Rather than clicking ‘back’ multiple times, i want to be able to click this once and then go back to the main menu screen.

Ive tried playing around with key mapper and the mce remote addon but cant seem to get round it. Am i missing something?

Im running Jarvis with Titan skin if that makes any difference.

TIA Smile