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Define a callback function on drag-and-drop event : when the user drag an item on another item.Parameters
ObjTree _CBtreeDrag ( ObjTree _tree_ fun [ObjTree u0 ObjTreeItem ObjTreeItem] u1 _callback_ u0 _user_ )
Return value
_tree_ any tree object _callback_ callback function on drag-and-drop event (supplemental parameters are dragged item and dropped item) _user_ user parameter
same tree object