DHTMLXTree : I need help in drag and drop operations

In some cases i want a node to exist at two places, i.e. in the dragged position and dropped postion (especially when the user presses the control key)

I need this functionality when the user presses the contol key and then drags the node… (control key + drag)

----need help regarding

The PRO edition supports mercy drag mode (items are copied in this case):

dhtmlx.com/docs/products/dhtmlxT … 1386152000