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/**
     * Used to notify that a pseudo-class has changed. Typically, this method is called from the invalidated
     * method of a property that is used as a pseudo-class.
     * <code>
     * private static final PseudoClass.State MY_PSEUDO_CLASS_STATE = PseudoClass.getState("my-state");
     *
     * BooleanProperty myPseudoClassState = new BooleanPropertyBase(false) {
     *
     *           @Override public void invalidated() {
     *                pseudoClassStateChanged(MY_PSEUDO_CLASS_STATE);
     *           }
     *
     *           @Override public Object getBean() {
     *               return MyControl.this;
     *           }
     *
     *           @Override public String getName() {
     *               return "myPseudoClassState";
     *           }
     *       };
     * <code>
     * @param pseudoClassState The PseudoClass.State that has changed.
     */
    protected void pseudoClassStateChanged(PseudoClass.State pseudoClassState) {
       // if there are styles that use the given pseudoClassState, mark this node as needing css update
    }

    /**
     * The pseudo-class state of a Node is the state pertaining to this class and all of its super classes. This method is
     * implemented by getting the pseudo-class state of the super class and then or'ing in the pseudo-class state of this class.
     * <code>
     * private static final PseudoClass.State MY_PSEUDO_CLASS_STATE = PseudoClass.getState("my-state");
     *
     * @Override public PseudoClass.States getPseudoClassStates() {
     *      PseudoClass.States states = super.getPseudoClassStates();
     *      if (isMyPseudoClassState()) { states.addState(MY_PSEUDO_CLASS_STATE); }
     *      return state;
     * }
     * <code>
     * @return PseudoClass.States representing the pseudo-class state of this node and the state of its super classes.
     *
     */
    public PseudoClass.States getPseudoClassStates() {
        PseudoClass.States states = PseudoClass.createStatesInstance(); ??[TBD - better to have a instance member and just clear it?]??
        if(isHover()) states.addState(HOVER_PSEUDOCLASS_STATE);
        if(isPressed()) states.addState(PRESSED_PSEUDOCLASS_STATE);
        if(isDisabled()) states.addState(DISABLED_PSEUDOCLASS_STATE);
        if(isFocused()) states.addState(FOCUSED_PSEUDOCLASS_STATE);
        if(impl_isShowMnemonics()) states.addState(SHOW_MNEMONICS_PSEUDOCLASS_STATE);
        return states;
    }