[horde] sort users name in Horde system(ldap auth backend)

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Hi there:
Horde cvs and Ldap auth-backend.
I'd like to know if i wanna have a ascending sort by user name for  users's list
in Administration->Users,what should i do ?


Horde/conf.php
$conf['auth']['admins'] = array('root at example.com');
$conf['auth']['checkip'] = true;
$conf['auth']['params']['hostspec'] = 'ldap.example.com';
$conf['auth']['params']['basedn'] = 'dc=example.com';
$conf['auth']['params']['uid'] = 'uid';
$conf['auth']['params']['objectclass'] = array('person');
$conf['auth']['driver'] = 'ldap';

Thank you

David