First, we'll create the tree viewer that will display the folder hierarchy.
首先，我们将创建显示文件夹层次结构的树查看器。
We want to build a tree viewer that displays the hierarchy of a model.
我们的任务是，构建一个树形的查看器用以显示模型的层次结构。
It must remember the hierarchy of files and folders for every version of the tree.
它必须记住树中每个版本的文件和目录的层级。
This provides the ability to override functionality already available in the class hierarchy tree.
这提供了在类层次树重写功能已经可用的能力。
In general, you should not sort a tree list whose hierarchy has been modified.
一般而言，您不应该排序已修改其阶层的树状清单。
In general, you should not sort a tree list whose hierarchy has been modified.
一般而言，您不应该排序已修改其阶层的树状清单。
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