CActiveForm 的问题 [ 新手入门 ]

<?php $form=$this->beginWidget('CActiveForm', array(
    'id'=>'message-form',
    'enableAjaxValidation'=>false,
)); 
$model->p_id='00001';
$model->author='00001';
?>
<div class="row">
    <?php echo $form->labelEx($model,'contact'); ?>
    <?php echo $form->textField($model,'contact',array('size'=>60,'maxlength'=>1000)); ?>
    <?php echo $form->error($model,'contact'); ?>
</div>
<div class="row buttons">
    <?php echo CHtml::submitButton($model->isNewRecord ? 'Create' : 'Save'); ?>
</div>
<?php $this->endWidget(); ?>

表单提交不了，怎么回事？