/**
    * Generate fieldset for administration popup.
    */
   function getCMSFields_forPopup ()
   {
      $fields = new FieldSet();
      
      $masterdataTab = new Tab('Stammdaten');
      $storeTab = new Tab('Filialen');
      
      $tabset = new TabSet("Root",
            $masterdataTab,
            $storeTab
      );
      $fields->push( $tabset );
      
      [ ... ]
      
      $storeField = new ComplexTableField(
            $this,
            'Filialen',
            'CompanyStore',
            array(
               'ID' => 'ID',
               'Street' => 'Straße',
               'Zipcode' => 'PLZ',
               'City' => 'Stadt'
            ),
            'getCMSFields_forPopup'
      );

      $storeTab->push( $storeField );
      
      return $fields;
   }