public function createChildControls()
 {
     $o = new TTextBox();
     $o->setId($this->genFilterId());
     $this->_control = $o;
     $this->createLabel($o->getId());
     $this->getControls()->add($o);
     if ($this->_vali) {
         $this->_vali->setControlToValidate($o->getId());
         $this->getControls()->add($this->_vali);
     }
 }