class diagram attribute not seen

hi, all:
I am new to argouml. I am using argouml 0.24 under mac os x 10.4.
While i am creating a class diagram, normally i hope to get '+ courseID :
int', while '+' stands for 'public', just as the picture in: 
http://argouml.tigris.org/tours/bdClassDiagram7.html

Unfortunately, although i am sure visibility of 'public' or 'private' is
checked from properties tab, there is still nothing from the diagram -- it
remains 'courseID : int', just like:
http://argouml.tigris.org/tours/bdClassDiagram6.html

I think perhaps i need to change the default configuration? Any one could
help?
Thanks a lot!

Best,
ye


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