TYPO3 Core

Hi,

in TYPO3 v6 and v7 I added values to my flexform with PageTS.
For example:

TCEFORM.tt_content.pi_flexform.gridelements_pi1.general.heightMode {     
   addItems {         
    auto = automode
    fullbrowserheight = browsermode     
   }
}

The coresponding flexform part is:

<?xml version="1.0" encoding="utf-8"?>
   <T3DataStructure>
     <meta>
       <langDisable>1</langDisable>
     </meta>
     <sheets>
       <general>
         <ROOT>
          <TCEforms>
        <sheetTitle>General</sheetTitle>
          </TCEforms>
          <type>array</type>
          <el>
            <heightMode>
              <TCEforms>
        <label>Height Mode</label>
                 <config>
                   <type>select</type>
                   <items></items>
        </config>
             </TCEforms>
            </heightMode>
    </el>
       </ROOT>
     </general>
   </sheets>
</T3DataStructure>

This does not work in Version 8LTS.
Is this by intend?

Regards
Heiko