Adobe FLEX 2-PROGRAMMING ACTIONSCRIPT 3.0 Manual page 169

myTextField.text = "hello";
this.root.addChild(myTextField);
In this code sample, points to the MovieClip display object container that
this.root
contains the code. In your actual code, you may specify a different container.
Use the method to add the child to a specific position in the child list of the
addChildAt()
display object container. These zero-based index positions in the child list relate to the
layering (the front-to-back order) of the display objects. For example, consider the following
three display objects. Each object was created from a custom class called Ball.
The layering of these display objects in their container can be adjusted using the
method. For example, consider the following code:
addChildAt()
ball_A = new Ball(0xFFCC00, "a");
ball_A.name = "ball_A";
ball_A.x = 20;
ball_A.y = 20;
container.addChild(ball_A);
ball_B = new Ball(0xFFCC00, "b");
ball_B.name = "ball_B";
ball_B.x = 70;
ball_B.y = 20;
container.addChild(ball_B);
ball_C = new Ball(0xFFCC00, "c");
ball_C.name = "ball_C";
ball_C.x = 40;
ball_C.y = 60;
container.addChildAt(ball_C, 1);
After executing this code, the display objects are positioned as follows in the
container
DisplayObjectContainer object. Notice the layering of the objects.
Working with display objects 169