Indeed we have introduced a new DragDropManager, but still the code related to the existing RadDragAndDropManager should be working. May you please specify what properties does not exist in the latest version?
In this help article it is described how to drag and drop between, as well as within, two RadGridViews. In the related example the entire source code is available.
Please let me know if you have any problems with the example.
the Telerik team
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