C#版折叠菜单示例源代码,点击“文件”菜单,当鼠标滑到最底部菜单的时候,可以展开更多的菜单内容,虽然是小技巧,我觉得挺实用的-C# version of the sample source code folding menu, click on the " File" menu, slide the bottom of the menu when the mouse when the contents of the menu can be expanded more, alth