private DoubleProperty                         threshold;
private double                                 _referenceValue;
private DoubleProperty                         referenceValue;
private String                                 _title;
private StringProperty                         title;
<BUG>private String                                 _subTitle;

private StringProperty                         subTitle;
</BUG>
private String                                 _unit;

private DoubleProperty                         threshold;
private double                                 _referenceValue;
private DoubleProperty                         referenceValue;
private String                                 _title;
private StringProperty                         title;
private String                                 _description;
private StringProperty                         description;
private String                                 _unit;
