[maemo-developers] How to get dbus-monitor to listen to more dbus messages?

[From: Jonathan Wilson]

I am trying to get dbus-monitor to listen to some dbus messages, 
(specifically the tklock_open and tklock_close messages sent from mce to 
systemui for the device lock state) and no combination of arguments to 
dbus-monitor seems to get dbus-monitor to output them.

After trying this
http://mvidner.blogspot.com/2008/05/d-bus-spying.html
to try and get dbus-monitor to show me what I wanted to see and nearly 
bricking my phone in the process, I am out of ideas.

Any ideas on how to get logs of these messages would be appreciated (and if 
editing the dbus config file is the right solution, I need exact steps to 
do it that are known to be safe and easily reversible)