Help With Dragable MC's!

What I’m trying to create is a movie clip that is draggable only from an upper, hovering “tab” of sorts. When you click the tab and drag, the mc comes along for the ride, but the mc wont drag when you click anywhere else on it. Man, I really hope that makes sense! I’m assuming it has somthing to do with a mc inside of another mc, but I’m pretty lost.

Thanks in advance!