code: public function getBetterButtonsActions()
      {
          $buttons = $this->getDefaultButtonList("BetterButtonsActions");
          $actions = $this->createFieldList($buttons);
  
          $this->owner->extend('updateBetterButtonsActions', $actions);
  
          return $actions;
      }
docs: Gets the default actions for all DataObjects. Can be overloaded in subclasses
  <code>
  public function getBetterButtonsActions()
  {
  $actions = parent::getBetterButtonsActions();
  $actions->push(BetterButtonCustomAction::create('myaction','Do something to this record'));
  
  return $actions;
  }
  </code>
  
  @return FieldList