Vista - What happened to my Windows Mobile Device Center (WMDC)?

Hardware: ASUS notebook
Display chip: Intel 852/855
Wireless Chip: Intel PRO/Wireless LAN 2100 3B mini PCI adaptor
OS: Windows Vista Ultimate (Build 6000)

All hardware devices are up and running.

When I open up WMDC, I can see these options:

(1) Audio volume
(2) Battery status
(3) External Display
(4) Sync Center
(5) Projector setting

There seems to be more, but I do not have the others.

Questions:
(1) LCD brightness control
(2) Display rotation control (But I can change the rotation from the Tablet PC setting in Control Panel, even it is not in WMDC)
(3) Wireless control

The help and supports says if these options are not there, the device driver has a problem.
Is there a way to add or remove these options from WMDC?
How do I add these missing options back to WMDC?

Do I access help from Microsoft, Intel, or ASUS?

Timu