Display Logic with two GridFields

$listToBeSearched = DoMezzo::get();
$autoCompleteField = new GridFieldAddExistingAutocompleter('toolbar-header-right');
$autoCompleteField->setSearchList($listToBeSearched);
$autoCompleteField->setSearchFields(array('Telaio', 'Targa'));
$autoCompleteField->setResultsFormat('$Telaio - $Targa');
$gridFieldConfig = GridFieldConfig::create()->addComponents(
    new GridFieldButtonRow('toolbar-header-right'),
        new GridFieldToolbarHeader(),
        new GridFieldDataColumns(),
        new GridFieldDeleteAction(true),
        new GridFieldDetailForm(),
        $autoCompleteField
);
$gridFieldConfig->removeComponentsByType('GridFieldAddNewButton');
$gridFieldConfig->addComponent(new GridFieldSortableRows('PosizioneTemplateMezzi'));
$mezzi = $this->SortedMezzi();
$gridfieldMezzi = new GridField('Mezzi', 'Mezzi', $mezzi, $gridFieldConfig);
$fields->addFieldToTab(
    'Root.MezziOperatori',
        DisplayLogicWrapper::create($gridfieldMezzi)
);


$listToBeSearched = DoOperatore::get();
$autoCompleteField = new GridFieldAddExistingAutocompleter('toolbar-header-right');
$autoCompleteField->setSearchList($listToBeSearched);
$autoCompleteField->setSearchFields(array('Cognome', 'Nome'));
$autoCompleteField->setResultsFormat('$Cognome - $Nome');
$gridFieldConfig = GridFieldConfig::create()->addComponents(
    new GridFieldButtonRow('toolbar-header-right'),
        new GridFieldToolbarHeader(),
        new GridFieldDataColumns(),
        new GridFieldDeleteAction(true),
        new GridFieldDetailForm(),
        $autoCompleteField
);
$gridFieldConfig->removeComponentsByType('GridFieldAddNewButton');
$gridFieldConfig->addComponent(new GridFieldSortableRows('PosizioneTemplateOperatori'));
$operatori = $this->SortedOperatori();
$gridfieldOperatori = new GridField('Operatori', 'Operatori', $operatori, $gridFieldConfig);
$fields->addFieldToTab(
    'Root.MezziOperatori',
        DisplayLogicWrapper::create($gridfieldOperatori)->displayIf('Mezzi')->isNotEmpty()->end()
);