ViewUI::$forms

public static $forms = array(
  'add-handler' => '\Drupal\views_ui\Form\Ajax\AddItem',
  'analyze' => '\Drupal\views_ui\Form\Ajax\Analyze',
  'handler' => '\Drupal\views_ui\Form\Ajax\ConfigHandler',
  'handler-extra' => '\Drupal\views_ui\Form\Ajax\ConfigHandlerExtra',
  'handler-group' => '\Drupal\views_ui\Form\Ajax\ConfigHandlerGroup',
  'display' => '\Drupal\views_ui\Form\Ajax\Display',
  'edit-details' => '\Drupal\views_ui\Form\Ajax\EditDetails',
  'rearrange' => '\Drupal\views_ui\Form\Ajax\Rearrange',
  'rearrange-filter' => '\Drupal\views_ui\Form\Ajax\RearrangeFilter',
  'reorder-displays' => '\Drupal\views_ui\Form\Ajax\ReorderDisplays',
);