Can anyone explain the listener mechanism of rich client?

[flag]

In the during of studying rich client, I am confused how the listener mechanism of rich client is implemented . I hope that you can explain the listener mechanism of rich client in detail,compared with the listener mechanism of swing. At the same time, I hope that you can give a simple
example. (Now, I am anxious to get reply)
Thank you very much.

[Keith Donald]

What part are you confused about?

[ddai2002]

i ma a fresh man on rcp,i just want to know
whether a command obj is listened by a component

or there is another mechinasm it works.

Thank you