How to handle drag/drop without violating MVVM principals?

Currently I have in my XAML

<TabControl  
    AllowDrop="True"
    PreviewDragOver="DragOver"
    PreviewDrop="Drop" />

All of my drag/drop code exists within the codebehind of my View, rather than within my ViewModel.

How can I handle drag/drop in my ViewModel without adding any dependencies on the View?