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xTree: moveItem(nodeId, 'up') and moveItem(nodeId, 'down') are broken!

I just started using the xTreeObject, and my start is not very good:
I am trying to move an item in a tree, either up or down. Both result in Javascript errors:

up:
Error: this._getPrevNode is not a function
Source File: http://..../dhtmlxtree.js
Line: 153

down:
Error: this._lastChild is not a function
Source File: http://..../dhtmlxtree.js
Line: 153

Error appears in both MSIE 7 and FF 2.0.0.12.
The functions '_getPrevNode' and '_lastChild' are indeed missing in the JS files...
How long till this has been fixed?

Thanks,

Arjan

All modes of "moveItem" supported only in pro edition.
    http://dhtmlx.com/docs/products/dhtmlxTree/samples/nodes_manipulation/pro_move_item.html?un=1205861711000