另外一项可以用来找到隐藏失效侦听器的技术是：防止指定侦听器对象在指定事件源上登记两次。
Another technique that can sometimes be used to find otherwise hidden lapsed listeners is preventing a given listener object from being registered twice with a given event source.
事件源从JNDI中获得EmitterFactory对象，并利用该对象来创建带有指定行为的发射器。
Event sources obtain the EmitterFactory from JNDI and use the object to create an emitter with the specified behavior.
GridView 也公开一个 RowUpdating 事件，允许您修改正在传递到数据源对象的值。
The GridView also exposes a RowUpdating event that allows you to modify the values being passed to the data source object.
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