说明：  VB利用API函数实现菜单的显示与隐藏，如上图的窗口顶部的菜单中，当把鼠标移过去的时候它会显示、移开后自动隐藏，大体上实现了所需的功能，对API有研究的朋友，你不妒参考一下别人的编写思路。
(VB API function menu display and hide, as shown above the menu at the top of the window, when the mouse is moved over when it is displayed, automatically hidden away, largely achieved the desired functionality, the API studyfriends, you do not jealous refer to someone else s writing ideas.)