Hi,
I gived a first try and start to build the wizard and the DistributionMap itSelf.
I put all my classes in the package Moose-MondrianScripts (is it a good idea?).
So, by dowloading the last version of this package, you will be able to test it by right-clicking on a 
FAMIXClassGroup in a MooseFinder 
(For the moment, I have only added a menu item to FAMIXClassGroup, but this visualization could be applied 
on any kind of element)
I fill-in the default inputs of the wizard with a working example, so that you can see how to use it.
Just tell me if it looks like to what you were expecting, what would you change?, what would you had?, any 
suggestions? 
The visualization itself is not yet well-implemented. I'm going to do that now :)