water-sorting action 水分选作用
Before the sorting action, the fourth row is expanded and the tree grid remembered it.
排序之前，第4行是展开的，树型网格记住了这个状态。
After the sorting action, the items were different, but the tree grid would still try to open the expando function of the fourth row.
排序之后，条目有所不同，但是属性网格仍然想要打开第4行的expando功能。
The sorting mechanism demonstrated here does a server side sort by invoking a command action.
这里展示的分类机制是服务器端通过调用命令动作来分类的。
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