Unfortunately this doesn’t cover certain child timeline instances. For example, when you have one timeline with some frames that are empty, and some frames that have movieclips that themselves have multiple frames. If it happens to be called when the top timeline is on an empty frame, there is no pointer available to the child timeline available to the code.

I don’t know how to get around this.

function stopAllChildMovieClips(displayObject:DisplayObjectContainer):void {
var numChildren:int = displayObject.numChildren;
for (var i:int = 0; i < numChildren; i++) {
var child:DisplayObject = displayObject.getChildAt(i);
if (child is DisplayObjectContainer) {
if (child is MovieClip) {
MovieClip(child).stop();
}
stopAllChildMovieClips(DisplayObjectContainer(child));
}
}
}