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