Hi,
Amaral wrote:
I woud appreciate if someone could help me to find out what is the 
visAD object which controls the size of the black display box, how to 
change its background color and how to clear the box borders. thanks 
for help. amaral.
I recommend you having a look and/or studying the tutorial: For example, 
some of your answers are answered in
http://www.geogr.uni-jena.de/~p6taug/visad/tutorial/s4/Section4.html#section4_14
and
http://www.geogr.uni-jena.de/~p6taug/visad/tutorial/s4/Section4.html#section4_12
Cheers,
Ugo