I want to create a custom form element for email that have a textfield and button and when click button send an email but ajax not working inside form elemen class. I test it in form api and it’s ok but when move in form element on button click nothing happend this is my code

<?php /**  * Created by IntelliJ IDEA.  * User: peter  * Date: 24/12/18  * Time: 13:59  */  namespace Drupalaqr_basicElement;   use DrupalCoreFormFormStateInterface; use DrupalCoreRenderElementFormElement;  /**  * Provides a form element to display a email.  *  *  * @FormElement("aqr_email")  */ class EmailElement extends FormElement {     public function getInfo() {     $class = get_class($this);     return [       '#pre_render' => [         [$class, 'preRenderSelect'],       ],     ];   }     public static function preRenderSelect($element) {     dump($element);     $email = [       '#type' => 'email',       '#title' => $element['#emailTitle'],     ];     $email = array_merge($email,$element['email']);     $btnSendCode = [       '#type' => 'ajax_button',       '#value' => $element['#btnSendCodeTitle'],       '#ajax' => [                  //////this ajax not work         'callback' => '::email',         'event' => 'click',       ],     ];      $btnSendCode = array_merge($btnSendCode,$element['btnSendCode']);     $verifyGroup = [       '#type' => 'fieldgroup',       '#attributes' => ['class' => ['hidden']],      ];     $verifyGroup['emailCode'] = [       '#type' => 'textfield',       '#title' => $element['#emailCodeTitle'],     ];     $verifyGroup['emailCode'] = array_merge($verifyGroup['emailCode'],$element['verifyGroup']['emailCode']);     $verifyGroup['btnVerifyCode'] = [       '#type' => 'ajax_button',       '#value' => $element['#btnVerifyCodeTitle'],       '#suffix' => '<div class="verification-desc email_verify">' . $element['#description'] . '</div>',     ];     $verifyGroup['btnVerifyCode'] = array_merge($verifyGroup['btnVerifyCode'],$element['verifyGroup']['btnVerifyCode']);      $element = [ //      '#attached'=>[ //        'library' => ['aqr_basic/state'], //        'drupalSettings' => [ //          'id' => $element['#id'], //          'cities' => json_encode($cities), //        ], //      ],       'email' => $email,       'btnSendCode' => $btnSendCode,       'verifyGroup' => $verifyGroup,       '#attributes' => ['id' => ['email-wrapper-id'], 'class' => ['email_verify']],     ];     dump($element);     return $element;   }     /**    * {@inheritdoc}    */   public static function valueCallback(&$element, $input, FormStateInterface $form_state) {     return $input;   }    public static function email(array &$form, FormStateInterface $form_state) {      dump($form);      return $form;   } }