Volume control Using HDMI

Hi. I have a problem with the audio using HDMI otuput.

I have a Vista MCE Remote control (VRC-1100). When i use the analog audio output (Realtek HD Audio) i can control the volume with the remote.But when i use the HDMI output (Nvidia High Definition Audio) i can't control the volume with the remote. I can't mute the volume. I control it with the TV remote.

How i can control the HDMI volume with the MCE Remote Control?

NOTE: i had the problem with XBMC 11.0 and i upgraded to XBMC 12.2 but the problem keep.


My system:
WinXP SP3 (32 bits)
Intel Atom CPU 230 @ 1.6GHZ
GPU: NVIDIA ION 512MB, Drivers ver: 196.42
1.5Gb RAM
NVIDIA HIGH DEFINITION AUDIO, Drivers ver: 1.0.0.63
Realtek HD Audio
XBMC Frodo 12.2