this.shadow = (shadow != null) ? shadow : Color.gray; this.darkShadow = (darkShadow != null) ? darkShadow : Color.black; this.highlight = (highlight != null) ? highlight : Color.lightGray; this.lightHighlight = (lightHighlight != null) ? lightHighlight : Color.white;
    public FieldBorder(Color shadow, Color darkShadow,                       Color highlight, Color lightHighlight)    {    }