AS3 - preventDefault() doesn't work in fullscreen (AIR) - actionscript-3

Question

I am trying to make a fullscreen program in air that does not become windowed when you press escape. Why is my program not working as it should, and how should make it work correct?
Code:
package
{
import flash.display.*;
import flash.events.*;
import flash.desktop.*;
import flash.text.*;
public class Main extends Sprite
{
public function Main():void
{
stage.scaleMode = StageScaleMode.NO_SCALE;
stage.align = StageAlign.TOP_LEFT;
stage.displayState = StageDisplayState.FULL_SCREEN_INTERACTIVE;
stage.addEventListener(KeyboardEvent.KEY_DOWN, keyDownHandeler);
}
private function keyDownHandeler(e:KeyboardEvent):void
{
if (e.keyCode == 27)
{
trace("Hello");
e.preventDefault();
}
}
}
}

Answer 1

I created a new project (FlashDevelop) targeting AIR 14 (also successfully tried AIR 3.9) with the following document class file:
package
{
import flash.desktop.NativeApplication;
import flash.display.NativeWindow;
import flash.display.NativeWindowInitOptions;
import flash.display.NativeWindowRenderMode;
import flash.display.NativeWindowSystemChrome;
import flash.display.Sprite;
import flash.display.StageDisplayState;
import flash.events.Event;
import flash.events.FullScreenEvent;
import flash.events.KeyboardEvent;
import flash.events.MouseEvent;
import flash.ui.Keyboard;
public class Main extends Sprite
{
public function Main():void
{
if (stage) init();
else addEventListener(Event.ADDED_TO_STAGE, init);
}
private function init(e:Event = null):void
{
if(e) removeEventListener(Event.ADDED_TO_STAGE, init);
stage.addEventListener(KeyboardEvent.KEY_DOWN, keyUpHandler);
var content:Sprite = new Sprite();
content.graphics.beginFill(0xFFFF00);
content.graphics.drawRect(0, 0, 400, 500);
content.graphics.endFill();
addChild(content);
this.addEventListener(MouseEvent.CLICK, fullScreen);
stage.displayState = StageDisplayState.FULL_SCREEN_INTERACTIVE;
}
private function fullScreen(e:Event):void {
stage.displayState = StageDisplayState.FULL_SCREEN_INTERACTIVE;
}
protected function keyUpHandler(event:KeyboardEvent):void {
switch(event.keyCode) {
case Keyboard.ESCAPE:
trace("ESCAPE");
event.preventDefault();
break;
default:
trace("UNHANDLED KEY: ", event.keyCode);
}
}
}
}
It worked as expected. When hitting escape, the preventDefault() method on the key event successfully kept the application in full-screen.
Notes:
It has to be on the key down. Key up had no effect. The result was the same with the key down listener on the stage or the nativeApplication.