[vtkusers] Determining Actor type

[Kenneth Porter]

--On Saturday, February 20, 2010 6:27 AM -0700 David Gobbi 
<david.gobbi at gmail.com> wrote:

> Both IsA() and SafeDownCast() have the appropriate machinery and they
> just fine for intermediate classes.  Can you give an example where
> they don't work?

Sorry, I just did an eyeball inspection of the implementation. I guess I 
need to go back and see how this works with an intermediate class.