Keyboard events and scenes problem

Question

I have 2 scenes. In both scenes, I have a movie clip that moves via keyboard control.  If the goto next scene is triggered by the movie clip in the first scene the keyboard control works in the second.  However, if I use a button to move to the next scene then there isn't any control over the movieclip in that scene.  I've traced the keyCode in the second scene and it is picked up but the switch statement doesn't run. I'm migrating to Actionscript 3.0 and updating something I created in 2.0.  I would like to do it without writing a class.
Scene 1 code:
stop();
stage.addEventListener(KeyboardEvent.KEY_DOWN, doKeyDown);
function doKeyDown(e:KeyboardEvent):void {
switch (e.keyCode) {
  case Keyboard.LEFT :
   b1_mc.x-=5;
   break;
  case Keyboard.RIGHT :
   b1_mc.x+=5;
   if (b1_mc.x>350) {
    stage.removeEventListener(KeyboardEvent.KEY_DOWN,doKeyDown);
    gotoAndPlay(1,"Scene 2");
   break;
next_btn.addEventListener(MouseEvent.CLICK, goNextScene);
function goNextScene(e:MouseEvent):void {
stage.removeEventListener(KeyboardEvent.KEY_DOWN,doKeyDown);
gotoAndPlay(1,"Scene 2");
Scene 2 code:
stop();
stage.addEventListener(KeyboardEvent.KEY_DOWN, doKeyDown2);
function doKeyDown2(e:KeyboardEvent):void {
switch (e.keyCode) {
  case Keyboard.LEFT :
   b2_mc.x -= 5;
   break;
  case Keyboard.RIGHT :
   b2_mc.x += 5;
   break;

Answer 1

does it work the same if you use the following?  if yes, there's something other than the code you're showing that's causing the problem.
Scene 1 code:
stop();
stage.addEventListener(KeyboardEvent.KEY_DOWN, doKeyDown);
function doKeyDown(e:KeyboardEvent):void {
switch (e.keyCode) {
  case Keyboard.LEFT :
   b1_mc.x-=5;
   break;
  case Keyboard.RIGHT :
   b1_mc.x+=5;
   if (b1_mc.x>350) {
goNextScene(null);
   break;
next_btn.addEventListener(MouseEvent.CLICK, goNextScene);
function goNextScene(e:MouseEvent):void {
stage.removeEventListener(KeyboardEvent.KEY_DOWN,doKeyDown);
gotoAndPlay(1,"Scene 2");
Scene 2 code:
stop();
stage.addEventListener(KeyboardEvent.KEY_DOWN, doKeyDown2);
function doKeyDown2(e:KeyboardEvent):void {
switch (e.keyCode) {
  case Keyboard.LEFT :
   b2_mc.x -= 5;
   break;
  case Keyboard.RIGHT :
   b2_mc.x += 5;
   break;