Incredibly simple question

I've been at this for a little over 35 minutes and, quite frankly, it's embarrassing.  I've just upgraded from CS3 to CS5 and I can't seem to make the simpliest button work.

I've got a box that I converted to a button called reset_btn.  It's located on stage and on frame one.  I added a layer and F9'd it with the following code:

reset_btn.addEventListener(MouseEvent.CLICK, fireAway);

function fireAway(event:MouseEvent):void {
    trace("Can you hear me now?");
}

It keeps kicking it off and giving me this error:

Scene 1, Layer 'as3', Frame 1, Line 1    1120: Access of undefined property reset_btn.

I can see reset_btn just as clear as day in the library and I've quadrupal checked the spelling.  What am I missing?!