该示例程序使用了几个应用程序定义的子窗口，其中包含了各种控件。您可以通过点主窗口顶部的5个单选框，在不同子窗口之间进行切换。-The sample program uses a number of application-defined sub-window, which contains a variety of controls. You can point the main window at the top five single-box, in different sub-window