[TYPO3-english] TYPO3 FlexForm and "select" type

[Victor Livakovsky]

Hi, list.

I'm new in TYPO3 extension development and now trying to build my own 
extension, which should be inserted as plugin on a page and a list of 
defined categories should appear at multiple selector box at plugin's 
options.
I've created such FlexForm xml for that:

<T3DataStructure>
  <meta>
    <langDisable>1</langDisable>
    <langChildren>0</langChildren>
  </meta>
  <ROOT>
    <type>array</type>
    <el>
      <clubServices>
        <TCEforms>
          
<label>LLL:EXT:club_services/locallang_db.xml:pi1_flexform.services</label>
          <config>
            <type>select</type>
            <foreign_table>tx_clubservices_service</foreign_table>
            <foreign_table_where>AND 
tx_clubservices_service.pid=###STORAGE_PID### ORDER BY 
tx_clubservices_service.uid</foreign_table_where>
            <size>10</size>
            <minItems>0</minItems>
            <maxItems>100</maxItems>
          </config>
        </TCEforms>
      </clubServices>
    </el>
  </ROOT>
</T3DataStructure>

As I understood, such xml should build FlexForm with to lists: first one 
- shows selected elements, and the second one - shows full list of 
elements. But I can see only second - there is no firs list, that 
displays selection.

I've checked the TYPO3 Core API and the code there is exactly same, but 
there are two lists at screenshots. I'm fighting few hours with it, but 
can't find any solution. Please, give me a hint, if you know possible 
reason.
Thanks to everyone in advance.