树型布局（见图16）有助于您识别响应事件最慢的排列。
The tree layout (Figure 16) helps you identify which tier has the slowest response time.
在这个示例中使用的VBox部件是一种布局部件，它垂直地排列子部件。
The VBox widget used in this example is a type of layout widget that stacks its children vertically.
您能够拖动视图到面板中的任意位置，重新排列它们，或者当您需要返回原始布局时将它们归还到默认的透视图中。
You can drag the views anywhere along the pane, rearrange them, or revert back to the default perspective if you need to go back to the original layout.
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