安藤雅信粉引:tree的itemRollOver事件

myTreeDataProvider = new XML();
myTreeDataProvider.ignoreWhite = true;
myTreeDataProvider.load("tree_source.xml");
myTreeDataProvider.onLoad = function() {
myTree.dataProvider = myTreeDataProvider;
};
myTreeListener = new Object();
myTreeListener.change = function(eventObject) {
var theSelectedNode = eventObject.target.selectedNode;
var theSelectedNodeLabel = theSelectedNode.attributes.label;
txtl=theSelectedNode.attributes.link;
txtc=theSelectedNode.attributes.cont;
};

myTree.addEventListener("change",myTreeListener);
myTree.addEventListener("itemRollOver",myTreeListener);

myTreeListener.itemRollOver= function(eventObject) {

};
想要使itemRollOver的时候txtc显示该节点的cont属性
要怎样写 才可以得到被rollover的节点的内容呢?
flash中...