[TYPO3] simple selector box in flexforms

[Georg Ringer]

Hey,

how does the example of 
http://typo3.org/documentation/document-library/doc_core_api/columns_fieldnam-5/ 
looks like in flexforms because I have got problems with the converting of 
the array in xml.

This Example doesn't work:
     <size>
     <TCEforms>
      <label>Size</label>
       <config>
        <type>select</type>
        <items>
         <value>10</value>
         <value>11</value>
        </items>
        <size>20</size>
        <maxitems>35</maxitems>
       </config>

     </TCEforms>
     </size>

in the documentation there is written:
Array('Option 1', '1'),Array('Option 2', '2'),which I can't use like this

who can help me?
thx!
georg