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Changing the RowId

I have two Tree Grids in the page. I am dragging from First Tree grid to Second Tree Grid. If I dragged the same Object to too many Tree Grids, it is automatically changing the RowId of the selected while dropping on to the Target, But I don't want this , I want to keep the same RowId in all the Trees wherever I dropped, i.e. whatever the RowId it is holding in the Source Grid, I want to keep as it is eventhough I dropped the same Object to too many Trees. 

Ids should be unique in grid. So if you drop a row which has the same  id as a one in a target grid,  it is correct that the id is changed. You can redefine the random id, which is set automatically. But the new id  should not be the same with any of the existent ids in the grid. 
Please, have a look at the following post http://www.dhtmlx.com/docs/products/kb/index.php?s=normal&q=4203&a=5995 . There you can find information how id can be changed to another.