<?php echo $this->Form->create('Comment', array('controller'=>'Comments', 'action'=>'add'));?>
    <fieldset>
        <?php
        echo $this->Form->input('id_post', array('type'=>'hidden','value'=> $post['Post']['id']));
        echo $this->Form->input('username');
        echo $this->Tinymce->input('Comment.body', array(
            'label' => 'Content'
            ),array(
            'language'=>'en'
            ),
            'bbcode'
            );

            ?>
        </fieldset>
        <?php echo $this->Form->end(__('Submit'));?>
    </div>