wp_editor and AJAX

I’m loading via ajax a new wp_editor()

Everything worked fine on version 3.8.2

The problem is the scripting. The working version on 3.8.2 is

var settings = {
   id: 'ajax_wp_editor',
   buttons: 'strong,em,link,block,del,ins,img,ul,ol,li,code,spell,close'
};

quicktags(settings);
QTags._buttonsInit();

tinymce.execCommand('mceAddControl', true, 'ajax_wp_editor');

This was working fine. On 3.9 … not so much. I read somewhere to change from mceAddControl to mceAddEditor, but that doesn’t help. Or isn’t enought.

Thank you