If you refresh an object set property of entity context, the RadGridView is not updated.
The sample code below does not work:
this.radGridView1.DataSource = entities.Countries;
int maxId = (from c in entities.Countries
orderby c.Id descending
select c.Id).First();
Country country = new Country();
country.Id = maxId + 1;
country.Name = Path.GetRandomFileName();
entities.Countries.AddObject(country);
entities.SaveChanges(System.Data.Objects.SaveOptions.AcceptAllChangesAfterSave);
entities.Refresh(System.Data.Objects.RefreshMode.StoreWins, entities.Countries);