UPDATE single ROW from DATAGRID without refreshing the entire ItemsSource

Hello there,

   I have a simple datagrid that has an ItemsSource of ObjectQuery<DbDataRecord>.

   Let's say I want to refresh a single row from the datagrid, (Because a specific item i know has been changed) without refreshing the entire ItemsSource because the source query is quite big.

Any ideas?

Thanks.

-- Jorge_M_P