fast update of one RadGridView row

[Mark]

Hi,

I have a RadGridView bound to a large DataTable. Changing data in one row of that DataTable does not trigger a refresh of the RadGridView - the DataTable changes are not reflected in the UI. I have tried the following:

RadGridView.ItemsSource = null;
RadGridView.ItemsSource = GridDataTable;

or:

RadGridView.Items.Refresh();

or:

RadGridView.Rebind();

Each takes a very long time, presumably because the entire DataTable is being reloaded into the grid view. Is there any way to refresh only the DataRow that has changed?