如果要隐藏组的成员线程，可以使用树控件折叠组。

If you want to hide the member threads for a group, you can use the tree control to collapse the group.

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第一个修改是使用树控件替换 “Refine By”（元数据）选项的显示。

The first is to replace the display of "Refine By" (metadata) options with a tree control.

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然后，在后面的小节中，将了解如何使用树控件显示和选择元数据条件，从而改进文档搜索的用户界面。

Then in a later section, see how the user interface can be improved for document search by using a tree control for displaying and selecting the metadata conditions.

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