本程序可以实现多视功能，并且，可以实现不同类的视图的统一显示，增加了界面的显示层次。-This program can achieve multiple visual function, and, can achieve a unified view of different types of shows, increasing the display level of the interface.

设计一个树视图类，树视可以有多列Item，且选中一个树节点时，可以修改该项的值。-Design a tree view of the class tree, as multiple columns Item, select a tree node, you can modify the value of the item.