i18n & Tree problem

When trying to get language dependent values through javascript from a translated tree model I only get the tree spacers without the actual values.

In my controller I have:

          $modelObj = new $model_name();

          if($modelObj->actsAs[0] == 'Tree') {

               $optionslist = $modelObj->generateTreeList(null, null, null, TREE_SPACER_ADMIN_LISTING);

          } else {

               $optionslist = $modelObj->find('list');

          }

          $options = '';

          foreach($optionslist as $key => $value) {

               $options .= '<option value="' . $key . '">' . $value . '</option>';

          }

          echo $options;

This worked fine in my 1 language site but after changing to i18n the $value only holds the TREE_SPACER_ADMIN_LISTING without the actual $displayField value.

When used in combination with a NON-TREE-object it gives me a $displayfield value but not in the selected language

Can anyone tell me what to add to my code?  

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