code: function(class_name, cancel_sync) {
  
  		if (Firestorm.Array.exclude(this._static_classes, class_name)) {
  
  			if (this._is_inDOM && !cancel_sync) Firestorm.Element.removeClass(this.getDOMElement(), class_name);
  
  		}
  
  	}
docs: Remove a static CSS class
  @param {string} class_name
  @param {boolean} cancel_sync If <kw>true</kw> - do not remove the class from DOM element, just from local `_static_classes` array