Controlling Movie Clip with as3

Question

I try to controll my mc. I want put one MovieClip to other.
i use next code:
box_mc.addChild(pic_mc);
but its not working.
box_mc this is the a box movie clip, in this mc i want put my pic_mc.

Answer 1

In addition to what dmennenoh said,
DisplayObject's x and y properties are preserved no matter parent. In your case, it seems, original position of pic_mc is not 0/0. So when you place it inside the box - x and y are the same but now they are RELATIVE TO BOX. So, on screen it looks like it is outside the box but it is inside except that box's x and y are added.
For instnace, if the original coordinates are pic_mc.x = 200, pic_mc.y = 100 and box_mc.x = 50, box_mc.y = 20, when you add pic_mc as a child, it will have the came x and y but relative to box_mc (not its original container) and on the screen it will look like it is on x = 250 (box_mc.x + pic_mc.x) and y = 120 (pic_mc.y + box_mc.y).
box_mc's dimensions also change IF pic_mc x and y plus its width and height are outside of original box_mc boundaries. After you add child box_mc.width will be pic_mc.x + pic_mc.width and box_mc.height will be pic_mc.y + pic_mc.height.
I suspect that because there is a border in the box, you expected objects to placed within the border. Border in the box IS NOT the box but ANOTHER object (child) inside the box. In other words, box is a container. After pic_mc is added - it will contain both border and pic_mc - not border containing pic_mc. You see the difference?