Reaching in an attachedMovieClip

hey guys,

i’m having an issue accessing a movieClip button that lives in side an attached MC.

here is my AS:



// this is my attached MC function

function newPage(target){
	holder.attachMovie(target, "foo", _root.getNextHighestDepth());
}

/*
PROBLEM --
here is my problem... how am i  supposed to get to this button inside the attached MC?!

if i'm passing "target" inside my newPage function and then give it the instance name "foo", shouldn't this work?

*/
holder.foo.myButton.onRelease = function(){
	trace("hit");
}


// these buttons load my attached MC

b1.onRelease = function(){
	newPage("page1");
}

b2.onRelease = function(){
	newPage("page2");
}

SOURCE:
http://monkeyheadgraphics.com/theLab/reachingIn.fla