Putty/xterm window titlebar not updating

[B B]

When launching a bash shell on my Ubuntu 12.04 box either directly through
putty or xterm, or via a shell under screen from putty or xterm, the below
command correctly sets my putty window title to "testing" (and to "testing
on ${HOSTNAME}" in the case of xterm).

echo -ne "\033]0;testing\007"

But under a tmux managed shell, the same command has no effect. Any ideas?
My version info is...

~ $ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=12.04
DISTRIB_CODENAME=precise
DISTRIB_DESCRIPTION="Ubuntu 12.04.4 LTS"
~ $ dpkg -l tmux
Desired=Unknown/Install/Remove/Purge/Hold
|
Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Description
+++-==============-==============-============================================
ii tmux 1.6-1ubuntu1 terminal multiplexer


Thanks, -Blake

[B B]

I've isolated this to a byobu specific issue.

Post by B B
When launching a bash shell on my Ubuntu 12.04 box either directly through
putty or xterm, or via a shell under screen from putty or xterm, the below
command correctly sets my putty window title to "testing" (and to "testing
on ${HOSTNAME}" in the case of xterm).
echo -ne "\033]0;testing\007"
But under a tmux managed shell, the same command has no effect. Any ideas?
My version info is...
~ $ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=12.04
DISTRIB_CODENAME=precise
DISTRIB_DESCRIPTION="Ubuntu 12.04.4 LTS"
~ $ dpkg -l tmux
Desired=Unknown/Install/Remove/Purge/Hold
|
Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Description
+++-==============-==============-============================================
ii tmux 1.6-1ubuntu1 terminal multiplexer
Thanks, -Blake