[Typo3] T3DataStructure and radio

[Ismael BIDAU]

In an extension, I try to use flexforms.
So in TCA.php I have :
		'commentaire' => Array (
			'exclude' => 1,
			'label' =>  
'LLL:EXT:events/locallang_db.php:tx_events_list_etudiant_mm.commentaire',
			'config' => Array (
				'type' => 'flex',
				'ds' => array(
				'default' => '
					<T3DataStructure>
					  <meta>
						<langDisable>1</langDisable>
					  </meta>
					  <ROOT>
						<type>array</type>
						<el>
						<ecole_agence>
							<TCEforms>
								<label>Type de stage : </label>
								<config>
									<type>radio</type>
									… ???

I read  
http://typo3.org/documentation/document-library/doc_core_api/columns_fieldnam-10/  
to understand flexforms.
My problem is to use radio and select type. Anybody for helping me, please  
?