/**
  * Returns the data model based on the primary key given in the GET variable.
  * If the data model is not found, an HTTP exception will be raised.
  * @param integer $id the ID of the model to be loaded
  * @return NtpLaboratoryRequest the loaded model
  * @throws CHttpException
  */
 public function loadModel($id)
 {
     $model = NtpLaboratoryRequest::model()->findByPk($id);
     if ($model === null) {
         throw new CHttpException(404, 'The requested page does not exist.');
     }
     return $model;
 }
 public static function getReasonsForExamination()
 {
     $reasons = ZHtml::enumItem(NtpLaboratoryRequest::model(), 'reason_for_examination');
     $reasons[''] = '';
     asort($reasons);
     return $reasons;
 }
    <?php 
echo $form->label($model, 'submission_date', array('class' => 'control-label col-sm-4'));
?>
    <div class="col-sm-8">
        <?php 
echo $form->dateField($model, 'submission_date', array('class' => 'form-control'));
?>
    </div>
</div>

<div class="form-group">
    <?php 
echo $form->label($model, 'reason_for_examination', array('class' => 'control-label col-sm-4'));
?>
    <div class="col-sm-8">
        <?php 
echo $form->dropDownList($model, 'reason_for_examination', NtpLaboratoryRequest::getReasonsForExamination(), array('class' => 'form-control'));
?>
    </div>
</div>

<div class="form-group">
    <div class="col-lg-offset-4 col-lg-8">
        <?php 
echo CHtml::submitButton('Search', array('class' => 'btn btn-success'));
?>
    </div>
</div>

<?php 
$this->endWidget();