Can you do this: myMC.getChildAt(3).addChild(imgLoader);

[JeffInHighDef]

     Flash is throwing errors when I try it. "Scene 1, Layer 'Layer 3', Frame 1, Line 177    1061: Call to a possibly undefined method addChild through a reference with static type flash.display:DisplayObject."

    How could I do this without knowing the name of the child, only the number?

          Thsi is what I tried: myMC.getChildAt(3).addChild(imgLoader);

[kglad · Accepted solution]

cast that child as a displayobjectcontainer:

DisplayObjectContainer(myMC.getChildAt(3)).addChild(imgLoader);