if (obj instanceof CategoryTick && super.equals(obj)) {
            CategoryTick that = (CategoryTick) obj;   
            if (!ObjectUtilities.equal(this.category, that.category)) {
                return false;   
            }
            if (!ObjectUtilities.equal(this.label, that.label)) {
                return false;   
            }
            if (!ObjectUtilities.equal(this.labelAnchor, that.labelAnchor)) {
                return false;   
           }
            return true;