code: function(class_name, cancel_sync) {
  
  		if (Lava.schema.DEBUG && (!class_name || class_name.indexOf(' ') != -1)) Lava.t("addClass: expected one class name, got: " + class_name);
  
  		if (Firestorm.Array.include(this._static_classes, class_name)) {
  
  			if (this._is_inDOM && !cancel_sync) Firestorm.Element.addClass(this.getDOMElement(), class_name);
  
  		}
  
  	}
docs: Add static CSS class
  @param {string} class_name
  @param {boolean} cancel_sync If <kw>true</kw> - do not add that class to DOM element, just to local `_static_classes` array