public function search()
{
// Warning: Please modify the following code to remove attributes that
// should not be searched.
$criteria = new CDbCriteria();
$criteria->compare('tax_class_id', $this->tax_class_id);
$criteria->compare('title', $this->title, true);
$criteria->compare('description', $this->description, true);
$criteria->compare('date_added', $this->date_added, true);
$criteria->compare('date_modified', $this->date_modified, true);
return new CActiveDataProvider($this, array('criteria' => $criteria));
}