code: function(property_name) {
  
  		if (Lava.schema.DEBUG && property_name == null) Lava.t("firePropertyChanged: property_name is null");
  
  		if (this._property_listeners[property_name] != null) {
  
  			this._callListeners(this._property_listeners[property_name]);
  
  		}
  
  	}
docs: Same as {@link Lava.mixin.Observable#_fire}, but for property listeners
  @param {string} property_name Name of the changed property