flash mx 2004 scrollpane basics

hey guys,
im having a real good time with the flash MX 2004 scrollpane component, basically i cant find any tutes or stuff about how to use it. I have a movie clip in my library 'testing_mc' and i dont know what to put into the contentPath box in the parameters of the scrollpane to make it work.

With a flash MX component it works by just putting in testing_mc, but it doesnt work that way with MX 2004, anyone know what to do with that?

Thanks heaps