code: public function synchronizeEntity($sSynchronizeEntity, $iId = null)
      {
          if ($iId !== null) { $this->_iIdEntity = $iId; }
  
          $this->_sSynchronizeEntity = $sSynchronizeEntity;
          return $this;
      }
docs: set the entity to synchronize with the formular
  
  @access public
  @param $sSynchronizeEntity
  @param  int $iId id of the primary key
  @return Form
  @internal param string $sSeparator separator between the fields