Let me update you with the recent changes regarding the RadTreeView control.
During the last year we did some improvements in the built-in drag&drop logic of the control. Until now the control supported two drag drop managers to handle the corresponding commands through the attached property telerik:TreeViewSettings.DragDropExecutionMode, which allows users to switch between both managers. The New setting corresponds to the DragDropManager
while the Legacy setting turns on the obsolete RadDragAndDropManager.
In our latest official release
(Q2 2014) the default setting of the attached property is New. This means that by default the DragDropManager will be activated.
You might tweak what gets visualized when you DragDrop via several properties we provided (you might find more information about them in our documentation). What I suggest is that you turn off the DragPreview Visibility and leave only the DragPreviewLine and DragTooltip:
I attached a sample image demonstrating the result. Let me know how this works for you and whether you need any further customization.
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