Need help with 'Virtual Controll'

Question

I have a Document Class Called Main, Im not used to using classes and document classes ect. So im making a racing game for Ipad. So i need virtual controls so the user can operate the automobile.
So within this class i have a function that controlls the player by key input.. (See code below)
The problem is, i went on the internet and found a 'virtual controll' for the movement. But i am unsure as how to implement it - The link (http://blog.flashgen.com/gaming/general-gaming-articles/virtual-controllers-for-touch-base d-devices-pt-2/)
The file comes with two things, a Fla, and a ThumbStick.as, the thumbstic as is a document class its self so i can't have two document classes. I really need this to work as the project is due soon. (I will attach the thumbstick.as code below aswell)
HERE IS THE CODE THAT ALLOWS THE PLAYER TO MOVE.   
// respond to key events
stage.addEventListener(KeyboardEvent.KEY_DOWN,keyPressedDown);
stage.addEventListener(KeyboardEvent.KEY_UP,keyPressedUp);
// advance game
addEventListener(Event.ENTER_FRAME, moveGame);
// set arrow variables to true
public function keyPressedDown(event:KeyboardEvent) {
if (event.keyCode == 37) {
leftArrow = true;
} else if (event.keyCode == 39) {
rightArrow = true;
} else if (event.keyCode == 38) {
upArrow = true;
} else if (event.keyCode == 40) {
downArrow = true;
// set arrow variables to false
public function keyPressedUp(event:KeyboardEvent) {
if (event.keyCode == 37) {
leftArrow = false;
} else if (event.keyCode == 39) {
rightArrow = false;
} else if (event.keyCode == 38) {
upArrow = false;
} else if (event.keyCode == 40) {
downArrow = false;
// main game function
public function moveGame(e) {
// see if turning left or right
var turn:Number = 0;
if (leftArrow) {
turn = .3;
} else if (rightArrow) {
turn = -.3;
// if up arrow pressed, then accelerate, otherwise decelerate
if (upArrow) {
speed += .1;
if (speed > 5) speed = 5; // limit
} else {
speed -= .05;
if (speed < 0) speed = 0; // limit
// if not on the road, then slow down
if (!ground.road.hitTestPoint(275,350,true)) {
speed *= .95;
// if moving, then move and turn
if (speed != 0) {
movePlayer(-speed*10);
turnPlayer(Math.min(2.0,speed)*turn);
zSort();
private function movePlayer(d) {
// move player by moving terrain in opposite direction
worldSprite.x += d*Math.cos(dir*2.0*Math.PI/360);
worldSprite.z += d*Math.sin(dir*2.0*Math.PI/360);
// move car opposite of terrain to keep in place
car.x -= d*Math.cos(dir*2.0*Math.PI/360);
car.y += d*Math.sin(dir*2.0*Math.PI/360);
private function turnPlayer(d) {
// change direction
dir += d;
// rotate world to change view
viewSprite.rotationY = dir-90;
// rotate all trees and car to face the eye
for(var i:int=0;i<worldObjects.length;i++) {
worldObjects[i].rotationZ -= d;
// sort all objects so the closest ones are highest in the display list
private function zSort() {
var objectDist:Array = new Array();
for(var i:int=0;i<worldObjects.length;i++) {
var z:Number = worldObjects[i].transform.getRelativeMatrix3D(root).position.z;
objectDist.push({z:z,n:i});
objectDist.sortOn( "z", Array.NUMERIC | Array.DESCENDING );
for(i=0;i<objectDist.length;i++) {
worldSprite.addChild(worldObjects[objectDist[i].n]);
HERE IS THE THUMBSTIC.AS CODE -
package 
import flash.display.Sprite;
import flash.events.TouchEvent;
import flash.system.Capabilities;
import flash.events.MouseEvent;
import flash.events.Event;
import flash.ui.Multitouch;
import flash.ui.MultitouchInputMode;
import flash.events.KeyboardEvent;
import flash.ui.Keyboard;
public class ThumbStick extends Sprite
private var _thumb :Sprite;
private var _surround :Sprite;
private var _boundary :Sprite;
private var _degrees :Number;
private var _radius :Number = 25;
private var _primaryKeyCode :int;
private var _secondaryKeyCode :int;
private var _previousPrimaryKeyCode :int;
private var _previousSecondaryKeyCode :int = 0;
public function ThumbStick()
_thumb = thumb;
_surround = surround;
_boundary = boundary;
_boundary.width = 200;
_boundary.height = 200;
_boundary.alpha = 0;
Multitouch.inputMode = MultitouchInputMode.TOUCH_POINT;
if(Capabilities.cpuArchitecture == "ARM")
Multitouch.inputMode = MultitouchInputMode.TOUCH_POINT;
_thumb.addEventListener(TouchEvent.TOUCH_BEGIN, onThumbDown);
_thumb.addEventListener(TouchEvent.TOUCH_END, onThumbUp);
_surround.addEventListener(TouchEvent.TOUCH_END, onThumbUp);
_boundary.addEventListener(TouchEvent.TOUCH_END, onThumbUp);
else
_thumb.addEventListener(MouseEvent.MOUSE_DOWN, onTestThumbDown);
_thumb.addEventListener(MouseEvent.MOUSE_UP, onTestThumbUp);
_surround.addEventListener(MouseEvent.MOUSE_UP, onTestThumbUp);
_boundary.addEventListener(MouseEvent.MOUSE_UP, onTestThumbUp);
protected function initDrag():void
_thumb.startDrag();
addEventListener(Event.ENTER_FRAME, onThumbDrag);
protected function resetThumb():void
removeEventListener(Event.ENTER_FRAME, onThumbDrag);
killAllEvents();
_thumb.stopDrag();
_thumb.x = 0;
_thumb.y = 0;
protected function onThumbDrag(e:Event):void
// Store the current x/y of the knob
var _currentX :Number = _thumb.x;
var _currentY :Number = _thumb.y;
// Store the registration point of the surrounding 'joystick holder'
var _registrationX :Number = _surround.x;
var _registrationY :Number = _surround.y;
// Subtract the two from each other to get the actual x/y
var _actualX :Number = _currentX - _registrationX;
var _actualY :Number =  _currentY - _registrationY;
// Calculate the degrees for use when creating the zones.
_degrees = Math.round(Math.atan2(_actualY, _actualX) * 180/Math.PI);
// Calculate the radian value of the knobs current position
var _angle :Number = _degrees * (Math.PI / 180);
// As we want to lock the orbit of the knob we need to calculate x/y at the maximum distance
var _maxX :Number = Math.round((_radius * Math.cos(_angle)) + _registrationX);
var _maxY :Number = Math.round((_radius * Math.sin(_angle)) + _registrationY);
// Check to make sure that the value is positive or negative
if(_currentX > 0 && _currentX > _maxX || _currentX < 0 && _currentX < _maxX)
_thumb.x = _maxX;
if(_currentY > 0 && _currentY > _maxY || _currentY < 0 && _currentY < _maxY)
_thumb.y = _maxY;
dispatchKeyCombo();
protected function dispatchKeyCombo():void
_secondaryKeyCode = 0;
// Thumb stick position - Right
if(_degrees >= -22 && _degrees <= 22)
_primaryKeyCode = Keyboard.RIGHT;
// Thumb stick position - Down
else if (_degrees >= 68 && _degrees <= 112)
_primaryKeyCode = Keyboard.DOWN;
// Thumb stick position - Left
else if((_degrees >= 158 && _degrees <= 180) || (_degrees >= -179 && _degrees <= -158))
_primaryKeyCode = Keyboard.LEFT;
// Thumb stick position - Up
else if(_degrees >= -112 && _degrees <= -68)
_primaryKeyCode = Keyboard.UP;
// Thumb stick position - Up/Left
else if(_degrees >= -157 && _degrees <= -113)
_primaryKeyCode = Keyboard.UP;
_secondaryKeyCode = Keyboard.LEFT;
// Thumb stick position - Down/Left
else if(_degrees <= 157 && _degrees >= 113)
_primaryKeyCode = Keyboard.DOWN;
_secondaryKeyCode = Keyboard.LEFT;
// Thumb stick position - Up/Right
else if(_degrees >=-67 && _degrees <= -21)
_primaryKeyCode = Keyboard.UP;
_secondaryKeyCode = Keyboard.RIGHT;
// Thumb stick position - Down/Right
else if(_degrees >= 23 && _degrees <= 67)
_primaryKeyCode = Keyboard.DOWN;
_secondaryKeyCode = Keyboard.RIGHT;
if(_primaryKeyCode != _previousPrimaryKeyCode)
dispatchEvent(new KeyboardEvent(KeyboardEvent.KEY_UP, true, false, 0, _previousPrimaryKeyCode));
_previousPrimaryKeyCode = _primaryKeyCode;
if(_previousSecondaryKeyCode != _secondaryKeyCode)
dispatchEvent(new KeyboardEvent(KeyboardEvent.KEY_UP, true, false, 0, _previousSecondaryKeyCode));
_previousSecondaryKeyCode = _secondaryKeyCode;
if(_secondaryKeyCode > 0)
dispatchEvent(new KeyboardEvent(KeyboardEvent.KEY_DOWN, true, false, 0, _secondaryKeyCode));
dispatchEvent(new KeyboardEvent(KeyboardEvent.KEY_DOWN, true, false, 0, _primaryKeyCode));
protected function killAllEvents():void
if(_primaryKeyCode)
dispatchEvent(new KeyboardEvent(KeyboardEvent.KEY_UP, true, false, 0, _previousPrimaryKeyCode));
if(_secondaryKeyCode > 0)
dispatchEvent(new KeyboardEvent(KeyboardEvent.KEY_UP, true, false, 0, _previousSecondaryKeyCode));
protected function onThumbDown(e:TouchEvent):void
initDrag();
protected function onThumbUp(e:TouchEvent):void
resetThumb();
protected function onTestThumbDown(e:MouseEvent):void
initDrag();
protected function onTestThumbUp(e:MouseEvent):void
resetThumb();

Answer 1

Edit, Thumbstick.as is not a document class it is a as file attahced to the actual graphic in the library. I guess the real problem (Besided adding it to my existing code) is adding it to the stage, as all my content for the game is added through code.