Control a nested MovieClip

Problem
You need to control nested MovieClip using as3

Solution
There are two ways to do this: 1. using dot syntax 2. using getChildByName See the examples below.

Detailed explanation

box_mc.tree_mc.alpha=.4;

//box_mc.getChildByName("tree_mc").alpha=.4;


Source:
controlNestedMovieClip