vc2008,wtl81,利用WTL81编写的带安装顺序的简易模板实例，没实现真正的安装功能，只供参考，其中捕获了许多按钮事件。-vc2008, wtl81, written by WTL81, with easy installation sequence template instance, did not realize the installation feature for reference only, which capture a lot of button events.