Default trace listener

[Blake]

I am trying to make a trace listener textbox that behaves like the
output window in VS, in that it shows trace messages from all trace
sources.

I created my own listener to write to a textbox and added this listener
to the trace.listeners collection but it will recieve messages sent via
the normal trace class.

Messages from other Tracesource objects are not received unless i
explicitly add my listener to their collections.

Unfortunately I can't do this with the some class libs that have been
compiled with TRACE active and use their own internal tracesource class
for sending messages.

I know that I can 'route' these messages via a config file, but it
doesn't seem possible to add my custom listener to the shared listeners
collection in code?

Thanks.