Powering a sign

I need a way to make a sign a power source. I've looked through the server code but I can't find a way to get it so that the sign is powered.

 

if you'd bothered to use the search you would have found this: http://forums.bukkit.org/threads/powered-sign.26279/

 

I did bother to search and I tried that but it doesn't change the torch to a sign when I use the sendBlockChange method.
And wouldn't I have to do that whenever the chunk is loaded with the fake sign in it ?

EDIT : I figured out the problem for not changing but would I have to change it for people who didn't have the chunk loaded when it changed, and then load the chunk with the block in it?

 

I don't know but remember that you must send the fake block when somebody (re)connects.