/**
  * @param GridField $gridField
  * @param string $name
  * @param string $title
  * @param string $actionName
  * @param array $args
  */
 public function __construct(GridField $gridField, $name, $title, $actionName, $args)
 {
     $this->gridField = $gridField;
     $this->actionName = $actionName;
     $this->args = $args;
     parent::__construct($name, $title);
 }
 function __construct()
 {
     parent::__construct('addtocampaign', _t('CAMPAIGNS.ADDTOCAMPAIGN', 'Add to Campaign'));
     $this->setUseButtonTag(false);
     $this->addExtraClass('add-to-campaign-action');
     $this->setValidationExempt(true);
     $this->addExtraClass('btn');
     $this->addExtraClass('btn-primary');
 }