How to use Auto Index in ispcp

[jingjingmaple]

Hi all,
My server is running on ubuntu 9.10 and i use ispCP Omega screenshot version (not stable version) i want to enabled auto index module for my domain
I try many method to enabled such as add a config into /etc/apache2/ispcp/mydomain.conf or change all "Options -Indexes" to "Options +Indexes in /etc/ispcp/apache/working/ispcp.conf but it's not work.
How to enabled Auto index?
thankyou.