Changing "red" behaviour for unimplemented features in DSSSL stylesheets ?

How can I
Change the "red" color for text, when I use an unimplemented features in DSSSL  
stylesheets ? (e.g. I used the <refsection> element)

Thanks for any help !

Peter Biechele

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Dr. Peter Biechele, E-Mail: 
beXtec GmbH, Gründerzentrum im "Tabakschopf Ringwald",
Kaiserstuhlstr. 3, D-79312 Emmendingen, Germany
URL: http://www.beXtec.com
Tel.: +49 7641 93339 61, Fax: +49 7641 93339 69