ActionScript 3.0 :: AddEventListener To Class MovieClip Object

I have Class MovieClip object that is being added to a scene. Within that Class is this code, which adds a different MovieClip to the original class. I can add an eventListener to the initial Class object (this.addEventListener ... etc), and that will work, yet it does not appear to work if I add it to this embedded object. There is no error, yet the object has no mouse over and does not execute the assigned function of the eventListener.

Here is the code:
b_frond = new BFrond();
addChild(b_frond);
b_frond.buttonMode = true;
b_frond.addEventListener(MouseEvent.CLICK, clickHandler);

I've also tried:
this.b_frond = new BFrond();
addChild(b_frond);
this.b_frond.buttonMode = true;
this.b_frond.addEventListener(MouseEvent.CLICK, clickHandler);