I am creating documentation labeling the circuits of electrical and network 
panels for a project of mine.

Enclosed is a minimal example.

What I would like is to define two macros:  \unused and \spare (\unused 
referring to a circuit with no breaker installed, while \spare referring to a 
circuit with a breaker, but no load).  I wish these definitions to not only 
include the represented text and font directives, i.e., {\tt [Unused]}, but also 
shade the cell in a background color.  However, I cannot seem to figure out how 
to do that.  Including the `[background=color,backgroundcolor=gray]' in the 
\define seems to be expanded back simply as text.

Any suggestions?

advTHANKSance.

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- Pavneet Arora