operation visibility? Also, how should I represent exceptions?

Hi,

I'm new to UML and ArgoUML. If I select private visibility for an 
operation in a class diagram, I see no indication of the visibility in 
the class diagram (I expect '-' to appear before the operation). Is this 
a feature?

Also, how should I represent exceptions that an operation can raise? My 
oreilly UML 2.0 in a nutshell book suggests adding a comment diagram 
listing the exceptions anchored to the operation. I think that would 
make a very cluttered model. Is there another way?

I saw somewhere someone had something like:

+ myOperation() : void {exception: MyException}

Is that kosher, and can I do it in ArgoUML?

Kendall