Instance names in 'submovies'?

Question

hello, i'm unsure of how to reference an instance name if
that instance is in a movieclip that is placed in the main movie.
i have a UIscrollbar component on the stage, the movie that
displays correctly in here is called mc_mySubMovie
mc_mySubMovie has 3 buttons in it, that i have given the
instance names of b1, b2, and b3
my main movie has the scrollbar on it, and i am unsure of how
to access the buttons within mc_mySubMovie in order to have them
make changes in the main movie, for example:
b1.addEventListener(MouseEvent.CLICK, doClick);
function doClick(e:MouseEvent):void
do something here
i must be missing something simple here?

Answer 1

you can reference a parent by using the parent property of
display objects and you can reference your main timeline by using
the root propety of display objects.