treeview expand client-side attributes

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i have a treeview
(id="trv")

i would like to do something like this:
trv.Attributes.Add("onexpand", "javascript:alert(this);");

i cannot make this work
i would like to know if this is the way I should do it, or should i
add some event somehow to each node

basically i would like to do some javascript action on each expand -
each (expanded) node
(later on collapse too)

i found this example in articles like this one:
http://p2p.wrox.com/topic.asp?TOPIC_ID=46824

thanks

.

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