code: function () {
          var self = this;
  
          self.classes.add('spacer');
          self.canFocus = false;
  
          return '<div id="' + self._id + '" class="' + self.classes + '"></div>';
        }
docs: Renders the control as a HTML string.
  
  @method renderHtml
  @return {String} HTML representing the control.