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dhtmlXTree source id

I'm using the following when I drag something (a link in my case) into a tree:

tree.attachEvent("onDragIn", function(sid,tid) {
alert("dragged"+sid+"into the"+tid)
})

The above works, except the sid is "undefined". Here's a snippet of the code of the source:

tree = new dhtmlXTreeObject(....); // this works, I just left out the args
tree.enableDragAndDrop(true);
tree.makeDragable(id); // the id of the link, this works - I can drag the link to the tree and it shows up in the tree

I want the sid to contain the link - not be "undefined" like it is now. What am I missing or doing wrong??????

Existing code not assign unique IDs to custom drag elements, but it can be easily updated

dhtmlxtree_drag,js , line 21
    obj.parentObject=new Object;
    obj.parentObject.img=obj;
    obj.parentObject.id=obj.id;   // this line need to be added