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1) I would to know if it is possible to stop all the actions after a drop. When I return false to the function, I always get the drag item on the mouse cursor. I would it diseapear when I want cancel the drag & drop action.

2) I would like to know if it is possible to drag & drop an item without put it on the destination structure, ie just for put an item virtually in a tree structure.

1) You must use onDrag event. Returning false in onDrag event cancels current drag-n-drop operation (the similar event onDragIn - doesn't cancel drag-n-drop, but only denies drag to the current node).

2) You can drag any item, return false in onDrag method and use moveItem/addItem methods to imitate drag-n-drop result.

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