code: function () {
          var me = this;
  
          var ed = tinymce.get(me.getInputId());
          if (ed) {
              // The body cannot be disabled,
              // So we remove events from the
  
              tinymce.dom.Event.clear(ed.getBody());
              tinymce.dom.Event.clear(ed.getWin());
              tinymce.dom.Event.clear(ed.getDoc());
              tinymce.dom.Event.clear(ed.formElement);
  
              ed.onExecCommand.listeners = [];
  
              // We set the contentEditable to false
              var edIframe = Ext.get(me.getInputId() + "_ifr");
              edIframe.dom.contentDocument.body.contentEditable = false;
  
              // We disable all tool bar controls
              me.enableEditorControls(false);
          }
      }
docs: -----------------------------------------------------------------