_form.phtml

<div class="form">
  <?php if ($item->scenario !== 'update'): ?>
	<?php echo CHtml::statefulForm('', 'post', array('enctype' => 'multipart/form-data')); ?>
		<?php echo CHtml::hiddenField('MAX_FILE_SIZE', '1000000'); ?>
	<?php else: ?>
	<?php echo CHtml::statefulForm(); ?>
	<?php endif; ?>

		<?php echo CHtml::errorSummary($item); ?>

		<?php if ($item->scenario !== 'change'): ?>
		<div class="row">
			<?php echo CHtml::activeLabel($item, 'title'); ?>
			<?php echo CHtml::activeTextField($item, 'title'); ?>
		</div><!-- /.row -->
		<?php endif; ?>

		<?php if ($item->scenario !== 'update'): ?>
		<div class="row">
			<?php echo CHtml::activeLabel($item, 'image'); ?>
			<?php echo CHtml::activeFileField($item, 'image'); ?>
		</div><!-- /.row -->
		<?php endif; ?>
		
		<div class="row">
			<?php echo CHtml::submitButton('入力した内容を確認する', array('name' => 'confirm')); ?>
		</div><!-- /.row -->
</div><!-- /.form -->