将含有指定标签文字的新树状节点加入至目前树状节点集合的尾端。

Adds a new tree node with the specified label text to the end of the current tree node collection.

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当使用者停止编辑树状节点标签后，新的标签文字将被评估和储存。

After the user stops editing the tree node label, the new label text is evaluated and saved.

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清单10显示了我们想要支持的样式标签以及关联的说明文字。

Listing 10 shows the style tags that we want to support and the associated labels.

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