具有实现三态复选框控件功能的所有截图 代码，可以使界面更美好-Three-state check box control functions of all the screenshots code can make a better interface

XListCtrl_demo是多功能的ListCtrl,在ListCtrl中显示复选框，进度条，下拉菜单等功能-Versatile ListCtrl, display box, progress bar, pull-down menus and other features in ListCtrl