TStringGrid / TCalendar - highlighting multiple cells

Hiya all,

Is it possible/does any one know how to highlight more than one cell
(via source code) in a grid (either TStringGrid or TCalendar)?
If it is not possible, does any one know of a component that permits
this? This is for a friend who is trying to write something in the
nature of an appointments program/scheduler, wherein he wants to
highlight all the dates in the month in which the user has got an
appointment. The grid components seem (at least to us) not to have
any way of doing this. All tips received with gratitude.

Thanks all!

The Chief
--------
Dr. A{*word*73}la A. Olowofoyeku (The African Chief)
Email: la...@keele.ac.uk
Author of: Chief's Installer Pro 2.91 for Win16 and Win32:
           Winner of PC PLUS Magazine Gold Award (April 1995 U.K. edition)
           ftp://ftp.simtel.net/pub/simtelnet/win3/install/chief291.zip