In interfaces that don't employ direct manipulation, such as some modal dialog boxes, the concept of selection isn't always needed.
在那些没有直接操作的界面中，比如模型化的对话框，选择的概念就没有必要存在。
As we discussed in Chapter 21, the hallmark of bad interaction design is a user interface that consists primarily of control-laden modal dialog boxes.
对话框在第21章中我们讨论过，设计糟糕的一个标志就是用户界面上充斥大量的模态对话框。
As shown in Figure 2, Ext JS provides you with the ability to create modal dialog boxes for user input as well as the ability to implement a tabbed UI to maximize screen real estate.
如图2所示，Ext JS支持创建用于用户输入的模态对话框，还支持实现选项卡式用户界面，以便充分利用屏幕空间。
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