async getItem(itemPosition) {
        const items = await $(this.rootElement).$$('label');
        if (items[itemPosition]) {
            return new PageButtonOption(`${this.rootElement} label:nth-child(${itemPosition + 1})`);
        }
        return null;
    }
Returns a new ButtonOption page object of the element in item position.
@method
@param {number} itemPosition - The base 0 index of the radio.