this is in the JS file

/**
     * Abstract method that is executed when a node is collapsed.
     * @method onCollapse
     * @param node {Node} the node that was collapsed.
     * @deprecated use treeobj.subscribe("collapse") instead
     */
    onCollapse: function(node) { }

};



^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
tree.subscribe("collapse", function(node) {
               //alert(node.index + " was collapsed");
              return false;
        });


*************need to put that code  up in to that  file above******************