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public class PersonnummerTextBox : TextBox
{
    public bool TwelveDigits { get; set; }

    private int _leftPart;
    private Key _lastKey;

    public PersonnummerTextBox()
    {
        TextChanged += OnTextChanged;
        Loaded += OnLoaded;
    }

    private void OnLoaded(object sender, RoutedEventArgs e)
    {
        _leftPart = TwelveDigits ? 8 : 6;
    }

    /// <summary>
    /// Only allow digits and tab, no shifts or ctrl
    /// </summary>
    /// <param name="e"></param>
    protected override void OnKeyDown(KeyEventArgs e)
    {
        _lastKey = e.Key;   //used in OnTextChanged to handle Del key

        base.OnKeyDown(e);

        if (((e.Key >= Key.NumPad0 && e.Key <= Key.NumPad9) ||
            (e.Key >= Key.D0 && e.Key <= Key.D9) ||
            e.Key == Key.Tab) &&    //so that we can TAB out from the control ;)
            (Keyboard.Modifiers & ModifierKeys.Shift) == 0 &&
            (Keyboard.Modifiers & ModifierKeys.Control) == 0)
        {
            e.Handled = false;
            return;
        }

        e.Handled = true;
    }

    /// <summary>
    /// Make sure the dash (-) is placed on the correct place automatically
    /// either as yyyymmdd-nnnn or yymmdd-nnnn
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void OnTextChanged(object sender, TextChangedEventArgs e)
    {
        var leftPartPlusDash = (_leftPart + 1);
        var cursorPosition = SelectionStart;
        var strippedText = Text.Replace("-", "");

        if (strippedText.Length > _leftPart)
        {
            //move the cursor after the dash
            if (strippedText.Length == leftPartPlusDash &&
                cursorPosition == leftPartPlusDash && 
                _lastKey != Key.Delete) 
                cursorPosition = (_leftPart + 2);

            //put a dash in the right place
            Text = string.Format("{0}-{1}", 
                strippedText.Substring(0, _leftPart), 
                strippedText.Substring(_leftPart, Math.Min(4, strippedText.Length - _leftPart)));
        }
        else
            Text = strippedText;

        //move cursor to the wanted position
        SelectionStart = cursorPosition;
    }
}

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