WPF ObjectDataProvider with Mouse.GetPosition()

Question

I have the following code, dw:ObjectReference is an implementation which is supposed to point to a declared ViewPort3D not in the UserControl.Resources. Is this even possible? And if so what should I replace dw:ObjectReference with?

<ObjectDataProvider MethodName="GetPosition" ObjectType="{x:Type Mouse}" x:Key="odp">
        <ObjectDataProvider.MethodParameters>
            <dw:ObjectReference Key="vpView"/>
        </ObjectDataProvider.MethodParameters>
</ObjectDataProvider>