title: CKEDITOR.ui.dialog.button onClick function accessing editor content
body: <p>I'm working on a dialog for a button in <code>CKEditor 4.3</code>. In the click handler version, I would like to update the content of the editor, but so far I only found functions to access the dialog elements. I'm looking for something similar than <code>this.getParentEditor().getSelection().getSelectedElement()</code> which works fine in the <code>onShow</code> function. Is it possible and how to access the content directly from the <code>onClick</code> function?</p>