Lotus Widget Factory comes with a large number of predefined builders ranging from user interface components, such as buttons, to components responsible for fetching data from a remote Web service.

Lotus Widget Factory附带了大量预定义的构建器，从用户界面组件(比如按钮)到负责从远程Web服务获取数据的组件等等。

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It then associates the TreeItem widget and event type with the callback instance so that it knows how to proceed after the data for the RESTful Web service is returned.

然后，把TreeIte m部件和事件类型与这个回调实例关联起来，让它知道在RESTful Web服务返回数据之后如何处理数据。

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