VC++如何展开和选择树项的源码示例，也就是在窗体中使用树形菜单，如何让树状菜单展开及合拢，我觉得比较实用。-VC++ how to expand and select the tree item, source code examples, which is used in the form tree menu tree menu, how to make the commencement and close, I find it more practical.