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public class Watermark : Behavior<TextBox>
{
    private bool _hasWatermark;
    private Brush _textBoxForeground;

    public String Text { get; set; }
    public Brush Foreground { get; set; }

    protected override void OnAttached()
    {
        _textBoxForeground = AssociatedObject.Foreground;

        base.OnAttached();
        if (Text != null)
            SetWatermarkText();
        AssociatedObject.GotFocus += GotFocus;
        AssociatedObject.LostFocus += LostFocus;
    }

    private void LostFocus(object sender, RoutedEventArgs e)
    {
        if (AssociatedObject.Text.Length == 0)
            if (Text != null)
                SetWatermarkText();
    }

    private void GotFocus(object sender, RoutedEventArgs e)
    {
        if (_hasWatermark)
            RemoveWatermarkText();
    }

    private void RemoveWatermarkText()
    {
        AssociatedObject.Foreground = _textBoxForeground;
        AssociatedObject.Text = "";
        _hasWatermark = false;
    }

    private void SetWatermarkText()
    {
        AssociatedObject.Foreground = Foreground;
        AssociatedObject.Text = Text;
        _hasWatermark = true;
    }

    protected override void OnDetaching()
    {
        base.OnDetaching();
        AssociatedObject.GotFocus -= GotFocus;
        AssociatedObject.LostFocus -= LostFocus;
    }
}

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