Можно перетащить сразу несколько элементов. Для отображения перемещенных элементов WorkflowViewElements следовало заранее вызвать DragDropHelper.SetDragDropMovedViewElements.

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Multiple items are dragged and dropped. DragDropHelper.SetDragDropMovedViewElements should have been called to indicate the WorkflowViewElements that are moved.

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