Flex Builder 3 下载安装与注册码
Flex Builder 3 正式版，发布于中国时间 2008 年 2 月 25 日；
下载地址一：
http://download.macromedia.com/pub/flex/flex_builder/FB3_win.exe
大小： 424 MB ；未进行压缩的 Flex Builder 3 安装文件
不用注册登录，可以直接下载。
下载地址二：
http://trials.adobe.com/Applications/.../FB3_WWEJ.exe
大小： 385.84 MB ； 已经压缩的 Flex Builder 3 安装文件
需要注册登录，才可下载。
Flex builder 3.0注册码（已经试过的，可用的）：
1377-4168-2018-0771-2432-1495
1377-4760-3354-0772-2773-8996
1377-4165-2080-7265-7813-8901
1377-4964-5021-8182-2399-8235
Flex builder 中要进行调试，就必须安装含debug的flash player版本。下载链接地址：
Adobe Flash Player 9 — Debugger Versions (aka debug players or content debuggers) for Flex and Flash Developers
12/3/2007 Updated debugger versions of Flash Player 9 (aka debug players or content debuggers) are available for Flex Builder 2 users and Flash CS3 Professional users. These new players are version 9.0.r115.
Download the Windows Flash Player 9 ActiveX control content debugger (for IE) (EXE, 1.59 MB)
Download the Windows Flash Player 9 Plugin content debugger (for Netscape-compatible browsers) (EXE, 1.56 MB)
Download the Windows Flash Player 9 Projector content debugger (EXE, 3.69 MB)
Download the Macintosh Flash Player 9 Plugin content debugger (Intel-based Macs) (DMG, 5.35 MB)
Download the Macintosh Flash Player 9 Plugin content debugger (PowerPC-based Macs) (DMG, 2.41 MB)
Download the Macintosh Flash Player 9 Projector content debugger (ZIP, 4.81 MB)
12/3/2007 Updated Linux debugger versions (aka debug players or content debuggers) of Flash Player 9 are now available. Additionally, the Linux standalone player (projector) is available for developers who wish to publish projectors on Linux operating systems.
Download the Linux debugger and standalone players (TAR.GZ, 9.29 MB)
相关文档：
概要
当我们加载外部swf时，必须要了解应用程序域(Application Domain)。从Adobe官方文件中，我们可以得知应用程序域能够把处于同一个安全域(Security Domain)中的类分离开，这样就可以让一个类的多个定义共存，或是让多个子应用来共享父应用的类定义。简单点理解就是应用程序域为类定义提供了分区功能。
应用程序域
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<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
layout="vertical">
<mx:Script>
<
