Dragging movieclip one or more levels up

I have the following display structure

BASE (library instance of a movieClip)
[COLOR=White][/COLOR]|
[COLOR=White]
[/COLOR]Option[1] (array instance of MovieClip class)
[COLOR=White][/COLOR]|
[COLOR=White]
[/COLOR]Btn (library instance of a movieClip)
[COLOR=White][/COLOR]Option[2]
[COLOR=White]
[/COLOR]|
[COLOR=White]
____[/COLOR]Btn

How do I set the startDrag on, say, Option[1] from eventlisteners on its Btn?
Or, put another way…
How is Option[x] targetted from its Btn object?

any ideas? thanks lots!
Ikonik