function PropertyExtenders() {

}

	// Return instances that may provide extension properties

	// The target instance parameter is the instance to receive the

	// additional properties

PropertyExtenders.prototype.getPropertyExtenders = function(instance, targetInstance) {

	if (instance == targetInstance)

		return [instance.parent];

	return null;

}

PropertyExtenders.prototype.getExtensionSetNames = function(instance, targetInstance) {

	return null;

}