一款不错的侧边栏分类菜单控件(LeftMenu)，该控件改版后支持菜单按钮上下移动，支持代码动态插入菜单按钮及菜单，支持ImageList配合使用。定义菜单时仅在InitializeLeftMenu过程中加载分级菜单。-A good sidebar categories menu control (LeftMenu), after revision to support the control up and down the menu button to support the code to