protected JTextField getSampleTextField()
    {
        if (sampleText == null)
        {
            Border lowered = BorderFactory.createLoweredBevelBorder();

            sampleText = new JTextField(("AaBbYyZz"));
            sampleText.setBorder(lowered);
            sampleText.setPreferredSize(new Dimension(300, 100));
        }
        return sampleText;
    }