Craft\Formerly_SubmissionElementType::defineTableAttributes PHP Method

    public function defineTableAttributes($source = null)
    {
        $attributes = array('id' => 'ID');
        if (null === $source) {
            foreach (craft()->formerly_forms->getAllForms() as $form) {
                foreach ($form->getQuestions() as $question) {
                    if ($question->type != Formerly_QuestionType::MultilineText && $question->type != Formerly_QuestionType::CustomList && $question->type != Formerly_QuestionType::Assets && $question->type != Formerly_QuestionType::Checkboxes) {
                        $attributes[$question->handle] = $form->name . '-' . $question->name;
                    }
                }
            }
        } else {
            $form = craft()->formerly_forms->getFormByHandle(substr($source, 9));
            foreach ($form->getQuestions() as $question) {
                if ($question->type != Formerly_QuestionType::MultilineText && $question->type != Formerly_QuestionType::CustomList && $question->type != Formerly_QuestionType::Assets && $question->type != Formerly_QuestionType::Checkboxes) {
                    $attributes[$question->handle] = $question->name;
                }
                if (count($attributes) >= 5) {
                    break;
                }
            }
        }
        $attributes['dateCreated'] = Craft::t('Date Created');
        return $attributes;
    }