1.Set the TabIndex="16"

2.

private void detailGrid_Keydown(object sender, KeyEventArgs e)

{

try

{

if (e.Key == Key.Enter)

{

TraversalRequest request = new TraversalRequest(FocusNavigationDirection.Next);

UIElement focusElement = Keyboard.FocusedElement as UIElement;

if (focusElement != null)

{

focusElement.MoveFocus(request);

}

e.Handled = true;

}

}

catch (Exception e1)

{

ExceptionDialog.Show(e1);

}

}