_drawSelectOptionList(selectlist, optionlist) {
    const options = selectlist.querySelectorAll('option');
    forEach(options, (option) => {
      const optionElement = document.createElement('li');
      optionElement.innerHTML = option.innerHTML;
      optionElement.setAttribute('data-item', option.value);
      optionlist.appendChild(optionElement);
    });
  }
Make selectbox option list custom style
@param {HTMLElement} selectlist - selectbox element
@param {HTMLElement} optionlist - custom option list item element
@private