特别是，它支持多个主键字段，公开了一些用户界面的改进功能和一个处理与取消事件的新模型。
In particular, it supports multiple primary key fields and exposes some user interface enhancements and a new model for handling and canceling events.
做一个粗略的比喻的话，这就是和asp.net或WPF有点类似的模型，在这些模型中，你通过HTML或XAML来定义用户界面，在后置代码中处理事件。
In a rough analogy, this is a slightly similar model to ASP.NET or WPF, where you define your user interface in HTML or XAML, and have a code-behind page that handles events.
细粒度的事件处理对富用户界面至关重要。
Fine-grained event handling is the key to a rich user interface.
Flex中的大多数用户界面组件都可以处理用户事件。
Most of the user interface components in Flex can handle user events.
然后解释事件处理，基本和先进的用户界面控制，设计和布局，建立对话，组件和扩展功能等。
It then explains event handling, basic and advanced user interface controls, designing and layout, creating dialogs, components and extending functionality, and so on.
然后解释事件处理，基本和先进的用户界面控制，设计和布局，建立对话，组件和扩展功能等。
It then explains event handling, basic and advanced user interface controls, designing and layout, creating dialogs, components and extending functionality, and so on.
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