itemize with columns in \startcolumns enviroment

[Xan <dxpublica@telefonica.net>]

Hi,

I have

\startcolumns
[...]
\startexercici Amb el mateix experiment aleatori de l'activitat 
anterior, calcula els esdeveniments següents:
\startitemize[a,packed,columns]
\item $(A^c)^c$
\item $(A \cap B)^c$
\item $(A \cup B)^c$
\item $A^c \cup B$
\item $A^c \cap B$
\item $A \cup B^c$
\item $A^c \cap B^c$
\item $A \cap B^c$
\stopitemize
\stopexercici
[...]
\stopcolumns

but the itemize does NOt display as two columns. What is the solution 
for that?

Please, CCme

Thanks a lot,
Xan.

PS: The exercici enviroment is defined as:

\defineenumeration
  [exercici]
  
[text={\startcolor[middlecyan]Exercici\stopcolor},headstyle=bold,between=\blank,titledistance=0em,textdistance=1em,
stopper={.\space},location=serried,left={\bgroup\bf},right={\egroup},width=fit,headstyle=\ss]

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