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<?php
 
class Referenz extends Page {
     
  static $has_many = array(
    'RefImages' => 'RefImage',
    'Leistungen' => 'Leistung'
  );
     
    public function getCMSFields()
    {
        $fields = parent::getCMSFields();
         
        $manager = new DataObjectManager(
            $this,
            'RefImages',
            'RefImage',
            'Leistungen',
            'Leistung'
        ); 
        $fields->addFieldToTab("Root.Content.Referenze", $manager);
         
        return $fields;
    }
 
}
 
class Referenz_Controller extends Page_Controller {
     
 
}