The default value of the DragDropManager.TouchDragTrigger attached property is not respected. The default value is TapDown, but the touch drag starts on tap hold and move.

Since the 2017 R1 (2017.1.117) release the DragDropManager.TouchDragTrigger property is obsoleted. Use the TouchManager.DragStartTrigger property instead.

It would be great to be able to change the drag visual while dragging over certain controls, but when you don't have access to the DragInitialize event.

A sample scenario would be selecting a bunch of files from explorer, dragging over a grid, and the visual providing some information (such as file count, or some feedback as to what will happen on drop).

I have developed a UI with features of Drag and drop from RadGridView to RadTreeView, it worked perfectly in old version (2011 Q3), after I upgraded to new version (2014 Q4), I got a warning message for the RadDragAndDropManager because of obsolete and the drag & drop cannot work now. My question is whether I must upgrade RadDragAndDropManager to DragDropManager suggested by some articles, or I still can use the RadDragAndDropManager without affecting the exsiting features. 
Please refer to attachment for details.