gistfile1.txt

    public function getCMSFields() {

        $fields = parent::getCMSFields();
        
        $conf = GridFieldConfig_RecordEditor::create(10);
        $conf->addComponent(new GridFieldGalleryTheme('Image'));
        $conf->addComponent(new GridFieldBulkUpload());
        $conf->getComponentByType('GridFieldBulkUpload')->setConfig('folderName', $this->getRootFolderName());
        $fields->addFieldToTab("Root.Gallery", Gridfield::create('Gallery', 'Gallery', $this->Images(), $conf));         
        

        $config = GridFieldConfig_RelationEditor::create(); 
        $config->getComponentByType('GridFieldDataColumns')->setDisplayFields(array(  
            'Name' => 'Name',
            'Producer.Title'=> 'Producer' //??? where does title come from ?, i found it at tutorial 5
        )); 

        $producersField = new GridField(
            'Producers', 
            'Producer', 
            $this->Producer(), 
            $config
        );     
        $fields->addFieldToTab('Root.Producers', $producersField); 


        return $fields;
    }