gistfile1.php

<?php

        $factory = new Factory();

        $form = $factory->createForm(array(
            'input_filter' => $inputFilter,
            'fieldsets'    => array(
                array(
                    'spec' => array(
                        'name'     => 'user',
                        'hydrator' => $hydrator,
                        'options'  => array(
                            'label'                => 'Benutzer ändern',
                            'use_as_base_fieldset' => true,
                        ),
                        'elements'             => array(
                            array(
                                'spec' => array(
                                    'name' => 'username',
                                    'type' => 'Text',
                                    'options' => array(
                                        'label' => 'Benutzername*:'
                                    ),
                                    'attributes' => array(
                                        'maxlength' => 255
                                    )
                                )
                            ),
                            array(
                                'spec' => array(
                                    'name'       => 'email',
                                    'type'       => 'Text',
                                    'options'    => array(
                                        'label' => 'E-Mail*:'
                                    ),
                                    'attributes' => array(
                                        'maxlength' => 128
                                    )
                                )
                            ),
                            array(
                                'spec' => array(
                                    'name'       => 'email2',
                                    'type'       => 'Text',
                                    'options'    => array(
                                        'label' => 'E-Mail wiederholen*:'
                                    ),
                                    'attributes' => array(
                                        'maxlength' => 128
                                    )
                                )
                            ),
                            array(
                                'spec' => array(
                                    'name'       => 'initialpassword',
                                    'type'       => 'Text',
                                    'options'    => array(
                                        'label' => 'Initial-Passwort:'
                                    ),
                                    'attributes' => array(
                                        'maxlength' => 128
                                    )
                                )
                            ),
                            array(
                                'spec' => array(
                                    'name'       => 'role',
                                    'type'       => 'Select',
                                    'options'    => array(
                                        'label'         => 'Rolle*:',
                                        'value_options' => $roleValueOptions
                                    )
                                )
                            ),
                            array(
                                'spec' => array(
                                    'name'    => 'isParentUser',
                                    'type'    => 'Select',
                                    'options' => array(
                                        'label'         => 'Darf Benutzer anlegen',
                                        'value_options' => array(
                                            'false' => 'Nein',
                                            'true'  => 'Ja'
                                        )
                                    )
                                )
                            ),
                            array(
                                'spec' => array(
                                    'name'       => 'parentUserId',
                                    'type'       => 'Select',
                                    'options'    => array(
                                        'label'         => 'Übergeordneter Benutzer:',
                                        'value_options' => $parentUserIdValueOptions
                                    )
                                )
                            ),
                        )
                    )
                )
            ),
            'elements' => array(
                array(
                    'spec' => array(
                        'name'       => 'submit',
                        'type'       => 'Submit',
                        'attributes' => array(
                            'value' => 'Speichern'
                        )
                    )
                ),
            )
        ));

-----------------------------

        $form->setBaseFieldset($form->get('user'));
        $form->setHydrator($hydrator);