实现非常哭树空间，能对开发者有一顶的帮助，实现了天家和删除想-achieve very weeping tree space, the development will have a help to achieve a day to house and delete

在DataGrid中加入CheckBox可以进行选中删除，代码详细，思路清晰-Join in the DataGrid CheckBox can delete, the code in detail, clear thinking