ActionScript 3.0 :: Change Text In A Movie Clip

i'm trying to replace text in a dynamic text field within a movie clip, and it seems as if it's treating it like static text.

theBtn1.addEventListener(MouseEvent.CLICK, adjustText1);theBtn2.addEventListener(MouseEvent.CLICK, adjustText2);function adjustText1(e:MouseEvent):void{  textField1.text = "Foo"; // this works}function adjustText2(e:MouseEvent):void{  theMC.getChildByName("textField2").text = "Bar"; // this doesn't}

It throws this error:

1119: Access of possibly undefined property text through a reference with static type flash.display:DisplayObject.