[MinimizeToTray] changing calendar tray icon

[Tara Patterson]

Hi,

I use Minimize to Tray for Thunderbird and the Mozilla Calendar 
Thunderbird extension.  When I minimize both of these to the tray, the 
icons are both the same.  I'd like to change this so I can tell which is 
which without having to hover for the popup before restoring.  I 
followed the FAQ directions for changing the icon, which allows me to 
change the Thunderbird icon, but I can't figure out how to change the 
Calendar icon, which is what I really want to do, since I'm fine with 
the Thunderbird icon being the default, but I'd like to make the 
Calendar icon look like a calendar.  Any help?

Thanks,
Tara P.