Hi Bolarishu,
I do not know the Bose Lifestyle T20 system that well but having looked in the online manual, there does not seem to be any settings like I found on the Arcam AVR-400 that is equivalent to the CEC control that I used. When I was on the Bose site, there was a FAQ confirming
"is the system compatible with 3d blu-ray players" and this links to a firmware update that enables this on your system.
If this still does not work then your only other option is to connect the V+ box directly to your TV using the HDMI cable and then connect an optical digital lead from your V+ box to the matching port on your Bose system (under device 4 or 5).