如何让工具提示更加吸引用户？增加声音效果也许更有效。本程序就是介绍如何从CToolTipCtrl派生出一个CWavTipCtrl来实现播放声音功能。-tool tips for how to attract more users? Increase the sound effects may be more effective. The procedure is how to derive from CToolTipCtrl to realize a CWavTipCtrl is broadca