WPF DataGrid CellEditEnding - DataSet未更新Till Row Lost Focus

I need to be able to update values of a dataset once a cell loses focus from editing. I know when the cell loses focus (CellEditEnding), but problem is, the actual updating of it's context item does not occur till focus on that row actually occurs. This becomes a huge issue when there is only one item left, since it may never lose focus. I need to be able to update values of a dataset