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Tree drag and dont allow drag

Hi Team,

I am dragging items from grid to tree and using dhtmlx_extdrag.js
I am allowing drag only from grid.I don't want to allow drag from tree.
When I drag from tree I am getting following error,

this._checkMSelectionLogic is not a function
[Break on this error] function dhx_ext_check(sid,tid,sgrid,tgrid){if (sgrid.mytype=="tree")var nm="id"...


My code is,

tree.enableDragAndDrop(true);
tree.attachEvent("onDragIn",onTreeDragIn);
tree.attachEvent("onDrag",onTreeDrag);
tree.attachEvent("onBeforeDrag",function(){return false;});


function onTreeDragIn(sid,tree_node_id){
if(condition)
return dhx_allow_drag();
return dhx_deny_drop();
}

function onTreeDrag(row_id,target_id){
.....
logic
....
}

Please suggest any solution to remove this error and not allow drag on Tree.

Thanks,
Agile

>>When I drag from tree I am getting following error,
Which version of  dhtmlxtree|dthmlxgrid are you using? The problem may occur if you are mixing files from pro and standard editions.