undefined - благодаря Котяре, и СлаваРа - можно уже забыть про отладчик и встроить нормальный. Вот рабочий код

Код AS3:
package com.in4core.utils
{
import com.in4core.text.DisplayText;
import flash.display.LoaderInfo;
import flash.display.Sprite;
import flash.display.Stage;
import flash.events.ErrorEvent;
import flash.events.KeyboardEvent;
import flash.events.MouseEvent;
import flash.events.UncaughtErrorEvent;
import flash.text.TextField;
import flash.ui.Keyboard;
/**
* ...
* @author in4core progression lab
*/
public final class LoggerBox
{
private static var errorString:String = "";
private static var field:TextField = DisplayText.addField(null, 14, false, "none", true);
private static var errorBox:Sprite = new Sprite();
private static var closeBox:Sprite = new Sprite();
private static var holder:Stage = null;
public static function init(stage:Stage, loaderInfo:LoaderInfo):void
{
holder = stage;
errorBox.graphics.beginFill(0, 0.7);
errorBox.graphics.drawRect(0, 0, stage.stageWidth, stage.stageHeight);
errorBox.addChild(field);
field.x = field.y = 10;
field.textColor = 0xFFFFFF;
field.selectable = true;
field.multiline = true;
field.wordWrap = true;
field.width = stage.stageWidth - 50;
field.height = stage.stageHeight - 30;
closeBox.graphics.beginFill(0, 0);
closeBox.graphics.drawRect(0, 0, 15, 15);
closeBox.graphics.lineStyle(3, 0xFF0000);
closeBox.graphics.lineTo(15, 15);
closeBox.graphics.moveTo(0, 15);
closeBox.graphics.lineTo(15, 0);
closeBox.buttonMode = true;
closeBox.mouseChildren = false;
errorBox.addChild(closeBox);
closeBox.x = errorBox.width - 25;
closeBox.y = 10;
closeBox.addEventListener(MouseEvent.CLICK , closeBoxHandler);
errorString = '<font color="#FF0000">Some errors are happend :\n\n</font>';
if (loaderInfo.uncaughtErrorEvents)
{
loaderInfo.uncaughtErrorEvents.addEventListener(UncaughtErrorEvent.UNCAUGHT_ERROR, uncaughtErrorHandler);
}
}
static private function onKeyDOwn(e:KeyboardEvent):void
{
if (e.keyCode == Keyboard.ESCAPE)
{
holder.removeEventListener(KeyboardEvent.KEY_DOWN , onKeyDOwn);
closeBoxHandler(null);
}
}
private static function closeBoxHandler(e:MouseEvent):void
{
if (errorBox.parent) holder.removeChild(errorBox);
}
private static function uncaughtErrorHandler(e:UncaughtErrorEvent):void
{
e.preventDefault();
errorString += e.error.getStackTrace() + "\n\n";
field.htmlText = errorString;
if (!errorBox.parent) holder.addChild(errorBox);
holder.addEventListener(KeyboardEvent.KEY_DOWN , onKeyDOwn);
return;
if (e.error is Error)
{
var error:Error = e.error as Error;
errorString += error.message + "\n";
}
else if (e.error is ErrorEvent)
{
var errorEvent:ErrorEvent = e.error as ErrorEvent;
errorString += errorEvent.text + "\n";
}
else
{
errorString += e.error.toString() + "\n";
}
field.htmlText = errorString;
}
}
}
Вещается до строчки new Controller или любого другого инита так :

Код AS3:
LoggerBox.init(stage,loaderInfo);