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Refresh entity instance with DbContext

With EF4 CTP5 DbContext, what is the equivalent of this

    public void Refresh(Document instance)
    {
        _ctx.Refresh(RefreshMode.StoreWins, instance);
    }

I've tried this but it doesn't do the same thing, updating the instance

    public void Refresh(Document instance)
    {
        _ctx.ChangeTracker.DetectChanges();
    }

?

question from:https://stackoverflow.com/questions/5221314/refresh-entity-instance-with-dbcontext

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You must use this:

public void Refresh(Document instance)
{
  _ctx.Entry<Document>(instance).Reload();
}

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