Astra tree component

i'm trying figure out when branch node has been expanded/collapsed. in documentation find treeevent class item_open , item_close. (http://developer.yahoo.com/flash/astra-flash/classreference/)

which seem need.

i've got me tree setup data, else working. , add following:

import com.yahoo.astra.fl.events.treeevent;

mytree.addeventlistener(treeevent.item_open, openbranch);

mytree.addeventlistener(treeevent.item_close, closebranch);

function openbranch(e:treeevent) {

trace("hello openbranch");

}

function closebranch(e:treeevent) {

trace("hello closebranch");

}

neither 1 getting called. i've tried opening/closing both plus/minus , clicking on entry. nothing seems work.

anybody have experience tree component? or different 1 use?

anybody. i'm still trying item open/close events. i'm not sure who/what might dispatching them.

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