Focus mit Pfeiltasten ändern

private void Window_KeyUp(object sender, KeyEventArgs e)
{
    switch (e.Key)
    {
        case Key.Up:
            MoveFocus(FocusNavigationDirection.Previous);
            break;
        case Key.Down:
            MoveFocus(FocusNavigationDirection.Next);
            break;
    }
}
 
private void MoveFocus(FocusNavigationDirection direction)
{
    UIElement focusedElement = Keyboard.FocusedElement as UIElement;
 
    if (focusedElement != null)
        focusedElement.MoveFocus(new TraversalRequest(direction));
}