ho trovato il cane...

la configurazione contestuale
va inserita dopo la texarea interessata
trovi l'esempio in api_dialog.html

codice:
<textarea class="ckeditor" cols="80" id="editor1" name="editor1" rows="10">&lt;p&gt;This is some &lt;strong&gt;sample text&lt;/strong&gt;. You are using &lt;a href="http://ckeditor.com/"&gt;CKEditor&lt;/a&gt;.&lt;/p&gt;</textarea>
<script type="text/javascript">
		// Replace the <textarea id="editor1"> with an CKEditor instance.
		var editor = CKEDITOR.replace( 'editor1',
			{
			// Defines a simpler toolbar to be used in this sample.
			// Note that we have added out "MyButton" button here.
			toolbar : [ [ 'Source', '-', 'Bold', 'Italic', 'Underline', 'Strike','-','Link', '-', 'MyButton' ] ]
});
</script>