How to Connect Ableton live to Cubase timcode?

Hello ! Anbody knows how to syncronize Cubase with Ableton live and push?
I am Using Cubase 7,5 ,if this is a problem I don´t know.
When I installed the Ableton live it directly appeard in the “device” menu but in front of “Ableton live revire” it says disabled in brackets.
I Think I have some how to activate it. Was hoping I could get ableton live to follow the timcode from generated from cubase.
Best regards Staffan