VirtualFields Cakephp 3

Hello,

I used the virtualsfield function from the api but it doens't work what do i do wrong.

namespace App\Model\Table;

use Cake\ORM\Table;
use Cake\Validation\Validator;

class DocentenTable extends Table {
    protected function _getFullName() {
        return $this->_properties['voornaam'] . '  ' .
            $this->_properties['achternaam'];
    }
   
    public function initialize(array $config) {
        $this->belongsToMany('Klassen');
        $this->addBehavior('Timestamp');
    }
   
    public function validationDefault(Validator $validator) {
        $validator
                ->notEmpty('voornaam');
        return $validator;
    }
}

public function add(){
        $this->loadModel('Docenten');
        $klas = $this->Klassen->newEntity($this->request->data);
        if($this->request->is('post')){
            if($this->Klassen->save($klas)){
                $this->Flash->success(__('De klas is opgeslagen.'));
                return $this->redirect(['action' => 'index']);
            }
            $this->Flash->error(__('Het toevoegen is niet gelukt.'));
        }
        $docenten = $this->Docenten->find('list',[
                                                        'idField' => 'docent_id',
                                                        'valueField' => 'full_name'
                                                        ]);
        $this->set('docenten',$docenten);       
        $this->set('klas', $klas);
    }

But the full_name field is empty.

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