/** Supports equals with represented Object.

     *  This is required by Move[Down|Up]Action. Look at FilterNode.equals, for same requirement.

     * @param obj something to compare to this node or its represented Object.

     * @return true if this node is equal to parameter or node's represented Object is the same as the parameter.

     */

    public boolean equals (Object obj) {

        if ( obj == null ) {

            return false;

        }

        if ( super.equals (obj) ) {

            return true;

        }

        return getRepresentedObject().equals (obj)

            || obj.equals (getRepresentedObject());

    }