How to remove expand on label click on TextNode YUI Treeview ?

Question

I want to expand the Node only on click on Icon not on the label.

With yahoo ui 2.7 :

selfCategoryTree.tree.subscribe("labelClick", function(node) { alert(node.data.customData.id + " label was clicked"); });

So I catch the labelClick , I show an alert, but the Node is expanded.

EDIT:

I do this :

tree.subscribe("clickEvent", TreeOnClickEvent, this, true);
var TreeOnClickEvent = function(event, args){
    return false;
}

It's working fine but I don't get the node in TreeOnClickEvent. In documentation, args is the node (if I understand) but I don't get the label on args. Any idea ?