After you attached an item in UpdateRow you need to mark it as modified. Entities are attached in the state Unchanged. However to modify the state you'll need access to the ObjectStateManager which is a property of the context.
In EF 4.1 I was told there's a method Entry() in the context that allows you to set the state as well.
So the way that worked was to change the update method in the Generic repository class.
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