Using scrollpane with movie clip and attach movie

I’m dynamically attaching movie clips to an MC which is 750px wide and 2000px tall. That seems to work fine. I’d like to have this MC with its dynamically attached clips be able to scroll in a scrollpane.

i tried attaching the MC (that gets the little mc’s attached to it) to the scrollpane in the parameters settings of the scrollpane (in the properties window) but that doesn’t work!

anybody done this b-4? scrolling an mc that has other mc’s dynamically attached and stacked like this??? help!