[Dovecot] about .dovecot.sieve file can't found for directory

[F.Y]

Hi all :
   i used roundcube webmail and enable filter(managesieve) . i create 
some rules ,and the rule save in maildir . ok ..see my dovecot config:
# 1.2.15: /etc/dovecot/dovecot.conf
# OS: Linux 2.6.32-5-686 i686 Debian 6.0.5 ext3
log_path: /var/log/dovecot.log
log_timestamp: %Y-%m-%d %H:%M:%S
protocols: imap imaps pop3 pop3s managesieve
listen(default): *
listen(imap): *
listen(pop3): *
listen(managesieve): *:2000
disable_plaintext_auth: no
login_dir: /var/run/dovecot/login
login_executable(default): /usr/lib/dovecot/imap-login
login_executable(imap): /usr/lib/dovecot/imap-login
login_executable(pop3): /usr/lib/dovecot/pop3-login
login_executable(managesieve): /usr/lib/dovecot/managesieve-login
mail_privileged_group: mail
mail_uid: vuser
mail_gid: vgroup
mail_location: maildir:/home/data/domains/%d/%n/Maildir
mail_debug: yes
mbox_write_locks: fcntl dotlock
mail_executable(default): /usr/lib/dovecot/imap
mail_executable(imap): /usr/lib/dovecot/imap
mail_executable(pop3): /usr/lib/dovecot/pop3
mail_executable(managesieve): /usr/lib/dovecot/managesieve
mail_plugin_dir(default): /usr/lib/dovecot/modules/imap
mail_plugin_dir(imap): /usr/lib/dovecot/modules/imap
mail_plugin_dir(pop3): /usr/lib/dovecot/modules/pop3
mail_plugin_dir(managesieve): /usr/lib/dovecot/modules/managesieve
managesieve_logout_format(default): bytes=%i/%o
managesieve_logout_format(imap): bytes=%i/%o
managesieve_logout_format(pop3): bytes=%i/%o
managesieve_logout_format(managesieve): bytes(in=%i/out=%o)
lda:
   postmaster_address: fy at 5dshu.com
   mail_plugins: sieve
   mail_plugin_dir: /usr/lib/dovecot/modules/lda
   auth_socket_path: /var/run/dovecot/auth-master
auth default:
   mechanisms: plain login
   verbose: yes
   debug: yes
   passdb:
     driver: sql
     args: /etc/dovecot/dovecot-sql.conf
   socket:
     type: listen
     client:
       path: /var/spool/postfix/private/auth
       mode: 384
       user: postfix
       group: postfix
     master:
       path: /var/run/dovecot/auth-master
       mode: 384
       user: vuser
       group: vgroup
plugin:
   sieve_dir: /home/data/domains/%d/%n/Maildir/sieve
   sieve: /home/data/domains/%d/%n/Maildir/.dovecot.sieve

I create some rules, it can save for Maildir/sieve ,but can't found 
.dovecot.sieve  on Maildir.. i trying for google and baidu search 
engine,can't found any help .