Seems no body is interested in this topic.
Anyway I have got some alternative to do this.
When we bind treeview through XML or dataset, each node is actually rendered as an anchor(a) tag.
So you get a client side function called on "OnContextMenu" or "OnClick" of the treeview and follow this code.
var obj = window.event.srcElement;
var fullpath = obj.href();
Here in fullpath, you can get your fullpath for the selected node, added to some extra information. You can just split it and get the full path. And in my treeview, I am not giving any path for the URL field of the nodes.
In my case, i am splitting it by ','