How could Tapestry handle linked component

"airwing" <[email protected]>
Newsgroups gmane.comp.java.tapestry.devel
Message-ID <002d01c28fcd$ce6c8000$4975ba3d@airwing>
this is a very popular thing. such as, when I select a optinal context from a select list, the other component will change their value or appearance. in old way, it should write a javascript. but after using Tapestry, this seems difficult. 

any advice will be appreciated.
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