How to set the Sleep Detection button on latest firmware (2.5) & GUI?

[yunti]

I've upgraded one of my flircs to the lastest 2.5 software and enabled the sleep detection in the advanced setting as I did this. My understanding is this will allow only a single key to wake the htpc (rather than any key - which is the default).  

However how do I set which key to use.   (i'm using the flirx xbmc on my harmony ultimate remote - so would like to set - 'select' only to wake the htpc).

 

Thanks.

[jason]

There is a wake key on the keyboard controller view. Attached a screenshot and highlighted that for you.