[Pound Mailing List] poundctl command simply do not work

I'm trying to use the -b option for poundctl to disable a backend.

The command runs with the three fields listener service and backend.  The
command appears to work.

But when I list out the -X option it says all backends are enabled... even
though I just disabled it.  So the options for poundctl do not work.

Notice how the status for the backend index=1 it still set to "active"
after I disabled it.

[root@ ~]# /usr/sbin/poundctl  -c /var/lib/pound/pound.cfg -b 0 0 1

[root@ ~]# /usr/sbin/poundctl  -c /var/lib/pound/pound.cfg -X
<pound>
<listener index="0" protocol="HTTPS" address="0.0.0.0:443" status="active">
</listener>
<service index="0">
<backend index="0" address="10.0.2.21:443" avg="0.000" priority="5"
alive="yes" status="active" />
<backend index="1" address="10.0.3.22:443" avg="0.000" priority="5"
alive="yes" status="active" />
<session index="0" key="demo.lalala.com" backend="1" />
<session index="1" key="107.11.11.11" backend="1" />
</service>
</pound>