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    public function hookActionCMSPageFormBuilderModifier($params)

    {

        $formBuilder = $params['form_builder'];

        $fields = $this->field_definitions;

        foreach ($fields as $key => $value) {

            if (isset($fields[$key]['type'])) {

                $formBuilder->add($key, $fields[$key]['type'], $fields[$key]['options']);

            }

        }

    }