title: how to add a dropdown/button to ckeditor to insert content when selecting a dropdownItem
body: <p>I need to be able to add a dropdown or button to the ckeditor's toolbar that will pop up a list, and when a listitem would be clicked the text of that list item would be added to the ckeditor's content</p>
  
  <p>I also need to be ablee to change the content of that list, like to have a function:</p>
  
  <pre><code>function SetListsContent(arr)
  {
  //fill the list with the array arr
  ...
  }
  </code></pre>