If it is open source I don't think you have to ask. It'd be available in some code repository somewhere openly. I'm fiddling with something entirely unrelated right now (a power-button-menu rotation lock button instead of the status menu one ; only cssu relevant - because no one else was bothering to make one) but if you can't figure it out within a couple of hours I'll try to get around to looking up where the source code is for you.