该组件是控制视图可见性的一个实用组件。
This component is a utility that controls the visibility of views.
在启动的时候，可能只有一个或者没有视图可见，但该扩展的作者提前创建了这些视图，即使它们根本不会展现出来。
At startup, one or potentially none of the views would be visible, but the extension writer went ahead and created the views, even if they weren't going to be shown.
最简单的方式是使Team Organization视图可见(图36)，随着评估方案的完成，它也将得到更新。
The easiest way is to make the Team Organization view visible (Figure 36), and it will update as estimates are made.
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