一段很好的三态树代码，是用vc++开发的，要用三态树的朋友可以下载-For some very good code tri-state tree, is vc++ Developed to use three-state friend of the tree can be downloaded

VC程序中树型控件节点拖动的完美实现源代码-VC program, drag the tree control node in the source code to achieve the perfect