public static final String CONTENT_AREA_FILLED_CHANGED_PROPERTY = "contentAreaFilled";

    // Icons
    /** Identifies a change to the icon that represents the button. */
    public static final String ICON_CHANGED_PROPERTY = "icon";

    /**
     * Identifies a change to the icon used when the button has been
     * pressed.
     */
    public static final String PRESSED_ICON_CHANGED_PROPERTY = "pressedIcon";
    /**
     * Identifies a change to the icon used when the button has
     * been selected.
     */
    public static final String SELECTED_ICON_CHANGED_PROPERTY = "selectedIcon";

    /**
     * Identifies a change to the icon used when the cursor is over
     * the button.
     */
    public static final String ROLLOVER_ICON_CHANGED_PROPERTY = "rolloverIcon";
    /**
     * Identifies a change to the icon used when the cursor is
     * over the button and it has been selected.
     */
    public static final String ROLLOVER_SELECTED_ICON_CHANGED_PROPERTY = "rolloverSelectedIcon";

    /**
     * Identifies a change to the icon used when the button has
     * been disabled.
     */
    public static final String DISABLED_ICON_CHANGED_PROPERTY = "disabledIcon";
    /**
     * Identifies a change to the icon used when the button has been
     * disabled and selected.
     */
    public static final String DISABLED_SELECTED_ICON_CHANGED_PROPERTY = "disabledSelectedIcon";


    /** The data model that determines the button's state. */
    protected ButtonModel model                = null;  

    private String     text                    = ""; // for BeanBox
    private Insets     margin                  = null;
    private Insets     defaultMargin           = null;

    // Button icons
    // PENDING(jeff) - hold icons in an array
    private Icon       defaultIcon             = null;
    private Icon       pressedIcon             = null;
    private Icon       disabledIcon            = null;

    private Icon       selectedIcon            = null;
    private Icon       disabledSelectedIcon    = null;

    private Icon       rolloverIcon            = null;
    private Icon       rolloverSelectedIcon    = null;
    
    // Display properties
    private boolean    paintBorder             = true;  
    private boolean    paintFocus              = true;
    private boolean    rolloverEnabled         = false;   
    private boolean    contentAreaFilled         = true; 

    // Icon/Label Alignment
    private int        verticalAlignment       = CENTER;
    private int        horizontalAlignment     = CENTER;
    
    private int        verticalTextPosition    = CENTER;
    private int        horizontalTextPosition  = TRAILING;

    private int        iconTextGap             = 4;

    private int        mnemonic;
    private int        mnemonicIndex           = -1;

    private long       multiClickThreshhold    = 0;

    private boolean    borderPaintedSet        = false;
    private boolean    rolloverEnabledSet      = false;
    private boolean    iconTextGapSet          = false;
    private boolean    contentAreaFilledSet    = false;

    // Whether or not we've set the LayoutManager.
    private boolean setLayout = false;

    // This is only used by JButton, promoted to avoid an extra
    // boolean field in JButton
    boolean defaultCapable = true;

    /**
     * Combined listeners: ActionListener, ChangeListener, ItemListener.
     */
    private Handler handler;
    
    /** 
     * The button model's <code>changeListener</code>.
     */
    protected ChangeListener changeListener = null;