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drag and drop from grid to tree

I have a grid and a tree in one jsp page, now I want to use drag and drop item form grid to tree just for reading the grid id and target node id so I can move the dragged item into the group with target id by ajax code in my database after that I want to refresh grid again for deleting the item.

So I don't need to remove grid or add any new node to tree by dhtmlx!

this is my code:

tree.attachEvent("onDrop",function(source_id,target_id,bef_id,source_object,target_object){

if(source_object == grid){
alert(target_id);// just for test
}
return false;
})


tree.attachEvent("onDragIn",function(sid,tid){
if(tid == "locked_id") return false
return true
})

grid.attachEvent("onDragIn",function(sid,tid,sobj,tobj){
if(tobj == grid) return false
return true
})

but after drop dragged item on the tree firebug give me this error:

itemObject.parentObject is undefined
_recreateBranch()(tr.odd_light, Object htmlNode=table tr=tr childsCount=0 tempDOMM=0, undefined)dhtmlxtree.js (line 106)
_recreateBranch()(tr.odd_light, Object htmlNode=table tr=tr childsCount=0 tempDOMM=0)dhtmlxtree.js (line 103)
_dragIn()(td, Object entBox=div#empgridbox.gridbox _wcorr=0 _f2kE=true, td.standartTreeRow)dhtmlxtree.js (line 150)
stopDrag()(mouseup clientX=1208, clientY=97, undefined)dhtmlxcommon.js (line 50)
[Break on this error] {targetObject.XMLload=1;this._loadDynXM...ee.dpcpy)oldTree.deleteItem(_otiid)}else

I really need to give me help please...

Thanks a lot...

Could you please prove us full example where we can reproduce this issue including files which you are using to initialize grid. (You can send it directly to the support@dhtmlx.com)