title: CKEDITOR.editor.on not working with replaceAll
body: <p>I'm trying to capture an event from a plugin:</p>
  
  <pre><code>$(document).ready(function( ) {
      CKEDITOR.replaceAll( 'js-ckeditor' );
  
      CKEDITOR.editor.on('simpleuploads.startUpload', function (ev) {
          console.log(ev.data)
      });
  });
  </code></pre>
  
  <p>...but when I run it, I see the error <code>TypeError: CKEDITOR.editor.on is not a function</code>. What am I doing wrong here? According to the documentation editor should have a method "on" (which I can see when I inspect the object). By the way, both the textarea and plugin function well so replaceAll seems to work fine.</p>