Silverlight4 Drop target grid row?

I have a datagrid (Grid1) bound to an ObservableCollection of Customers. I have another datagrid (Grid2) bound to an observable of CustomerProperties. I want to drag a property out of Grid2 and drop it on a Customer (ie a row instance) on Grid1.
I'm using the MVVM pattern so I don't have direct control over the grid or it's rows so I can't hook an EventToCommand up to a row.
Does anyone know how to do this?
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JobbietronicConnect With a Mentor Author Commented:
I'm being a fool - I can do it with an item template.
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