用C#实战编程仿QQ导航菜单，当鼠标点击的时候会和QQ菜单一样向上或向下褶起，还可以加入声音，有用的可以研究一下。-Programming with C# real fake QQ navigation menu, when the mouse click menus, like the time and the QQ-fold up or down since you can add sound, that can be useful to look at.