Actionscript 3.0 and numeric stepper problem

OK, so when I trace any numeric stepper, the value is null and doesn't change when I increase or decrease the value.

Here's my code...

import flash.events.Event;

import flash.events.MouseEvent;

stop();

var resort:String;

var pets:String;

var adults:String;

var children:String;

trace(adultStepper.value);

trace(childStepper.value);

resortCombo.addEventListener(Event.CHANGE, resortHandler);

petsCheck.addEventListener(MouseEvent.CLICK, petHandler);

adultStepper.addEventListener(Event.CHANGE, adultHandler);

childStepper.addEventListener(Event.CHANGE, childHandler);

nextButton.addEventListener(MouseEvent.CLICK, nextpage);

function resortHandler(evt:Event):void {

resort = resortCombo.selectedItem.label;

}

function petHandler(evt:Event):void {

pets = String(petsCheck.selected);

}

function adultHandler(evt:Event):void {

adults = String(adultStepper.value); 

}

function childHandler(evt:Event):void {

children = String(childStepper.value);

}

function nextpage(evt:MouseEvent):void {

gotoAndStop("lodgePage");

}