动态添加、删除树形控件的节点，获取树形控件的选中项\TreeControlDemo\ReadMe.txt
..................................................\...............\res\Ledgoff.bmp
..................................................\...............\...\Ledgon.bmp
..................................................\...............\...\TreeControlDemo.ico
..................................................\...............\...\TreeControlDemo.rc2
..................................................\...............\Resource.h
..................................................\...............\StdAfx.cpp
..................................................\...............\StdAfx.h
..................................................\...............\TreeControlDemo.cpp
..................................................\...............\TreeControlDemo.dsp
..................................................\...............\TreeControlDemo.dsw
..................................................\...............\TreeControlDemo.h
..................................................\...............\TreeControlDemo.rc
..................................................\...............\TreeControlDemoDlg.cpp
..................................................\...............\TreeControlDemoDlg.h
..................................................\...............\Debug
..................................................\...............\res
..................................................\TreeControlDemo
动态添加、删除树形控件的节点，获取树形控件的选中项