When playing with Jacaranda I was trying to add balloon help to a
ClassShape so the Class comment is shown (if the class exists in
Smalltalk). 

RECTANGULAR BALLOON TEXT
        I would like to display the class
        comment the same way the browser does is, i.e. in a rectangle
        and not in a bubble. There is no problem creating a TextMorph
        with that text in it (other than the hyperlinks not working),
        but I don't know how to have the Moprh pop up when the mouse
        is hovering and disappear again. So how can I replace the
        yellow bubble by a rectangle ?

BTW: I like Jacarand and Connectors a lot !