format codes - font colours, background etc

can anyone point me in the direction of help and assistance in formatting
using expressions?
an example would be change font to red if negative
also to change the background colour matix when using the visibility options
many thanksDid you read this section in BOL? Among many other examples it contains an
example for formatting values red when the value is negative.
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/RSCREATE/htm/rcr_creating_expressions_v1_571v.asp
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"jez_uk" <nospam@.nospam.com> wrote in message
news:uwfdvy3ZEHA.3016@.tk2msftngp13.phx.gbl...
> can anyone point me in the direction of help and assistance in formatting
> using expressions?
> an example would be change font to red if negative
> also to change the background colour matix when using the visibility
options
> many thanks
>