Default [Q] Name of the statusbar background in framework-res.apk

I'm trying to change the opacity of the statusbar..

So far the statusbar at the top is transparent.
What I'm trying to do is when you pull down the statusbar and see the notifications.. I want to make where the background of where notifications appear to be also transparent.. which .png file is that X_x anyone know?
"I once stuck my hand down my pants and I made lemonade out of it."
I think that's how that quote goes.