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dhtmlXGridObject is not defined

Hi

I am using dhtmlxtreegrid.js

and on page load I am getting an error: dhtmlXGridObject is not defined dhtmlxtreegrid.js (line 9)
[Break on this error] dhtmlXGridObject.prototype._updateTGRSta...;if(r.state=="plus")this.expandKids(row)

same things happen with dhtmlxtreegrid_filter.js (line 11)
and dhtmlxtreegrid_lines.js (line 7)

Please advise.

Txs.

Problem may be caused by order of js file including, please be sure that files included in next order

dhtmlxcommon.js
dhtmlxgrid.js 
dhtmlxgridcell.js
dhtmlxtreegrid.js
...any other grid extension files...