title: how to set tinymce default content
body: <p>My tinymce version is 3.5.8. I want to set the default content, and try the way on official website and other ways by google, but all error. Some of error as below:</p>
  
  <pre><code>TypeError: tinyMCE.activeEditor is null
  [Break On This Error] 
  tinyMCE.activeEditor.selection.setContent('&lt;strong&gt;Some contents&lt;/strong&gt;');
  
  
  
  TypeError: tinyMCE.get(...) is undefined
  [Break On This Error]   
  
  tinyMCE.get('content').setContent('&lt;strong&gt;Some contents&lt;/strong&gt;');
  </code></pre>
  
  <p>Thanks a lot.</p>