树型datawindow，加上了3态的checkbox,很经典-Tree datawindow, with a 3-state checkbox, classic ... ...

pb应有系统中的树形菜单风格供用户选择，两种风格的菜单都应该提供-pb should be in the system tree for the user to select the menu style

实现树结构的展示以及一键展开和收缩树结构显示内容，批量选择和删除树节点(Realize the display of tree structure, expand and shrink tree structure with one key, select and delete tree nodes in batches)