为了处理被反射过来的控件通知消息，使用列于下表的消息映射宏和函数原型。
To handle a reflected control notification message, use the message-map macros and function prototypes listed in the table below.
Label控件用于通知消息被发送还是遇到错误。
A Label control to signal whether the message was sent or an error was encountered.
在上述的情况下，每个需要自定义背景控件的对话框都不得不处理控件颜色通知消息。
In the case above, every dialog box that wanted controls with custom backgrounds would have to handle the control color notification message.
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