title: Multiple TinyMCE instances on single page dosent give the value after form submit
body: <p>I am using multiple tinyMCE editors in my CakePHP application on single page. 
  This is a QnA application. </p>
  
  <p>My code is like this
  <strong>For question :</strong></p>
  
  <pre><code>&lt;script type="text/javascript"&gt;
      tinyMCE.init({
          mode:"textareas",
          theme:"simple"
      });
  
  &lt;/script&gt;
  &lt;form action="/qna/questions/add" class="innerForm" id="QuestionViewForm" method="post" accept-charset="utf-8"&gt;
  
      &lt;input name="data[Question][title]" placeholder="Please enter the title of your question" id="title"
             class="span7 focusBlur" maxlength="255" type="text"&gt;
      &lt;textarea name="data[Question][description]" id="description" class="span7 questionDescription" div="false"
                rows="5"&gt;Please enter
          description&lt;/textarea&gt;
      &lt;input class="btn blueBtn" type="submit" value="Add Your Question" data-original-title=""&gt;
      &lt;a href="javascript:;" class="link cancel" id="cancel" data-original-title=""&gt;Cancel&lt;/a&gt;
  
  &lt;/form&gt; 
  </code></pre>
  
  <p><strong>For answer :</strong> </p>
  
  <pre><code>&lt;form action="/qna/answers/add" class="innerForm" id="AnswerForm" method="post" accept-charset="utf-8"&gt; 
      &lt;textarea name="data[Answer][answer]" id="answer" class="span7 questionDescription" div="false"  rows="5"&gt;Please enter answer&lt;/textarea&gt;
      &lt;input class="btn blueBtn" type="submit" value="Add Your Question" data-original-title=""&gt;
      &lt;a href="javascript:;" class="link cancel" id="cancel" data-original-title=""&gt;Cancel&lt;/a&gt;
  </code></pre>
  
  <p></p>
  
  <p>But whenever I submit a question form, It give me the value in the text area, it skips the value in the tinyMCE.</p>
  
  <p>Output is : </p>
  
  <pre><code>Array
  (
  [Question] =&gt; Array
      (
          [resource_id] =&gt; 1003
          [type] =&gt; 0
          [title] =&gt; This is my question
          [description] =&gt; Please enter description
      )
  )
  </code></pre>
  
  <p>I typed the different description for question :(</p>
  
  <p>Thanks,
  Vijay</p>