Tkinter, problem when using 2 scrollbars

[Bryan Castillo]

> > I'd whip something up real quick, but I don't have Tk on this machine.
> >
> > Jeff
> >
> >
> 
> How's this:
> 
> class ScrolledListbox(Frame):
>     def __init__(self, parent):
>         Frame.__init__(self, parent)
> 

In perl/Tk there is a method Scrolled, in which the first parameter is
the name of the class/widget to create.  How might you implement
something like that in Python?

widget = Scrolled("Text", [text options])


I guess I really want to know how to invoke constructors to unknown
class types, where the class type is derived through a string.