[Cuis] PluggableListMorph

[Dan Norton]

Greetings,

PluggableListMorph has valuable behavior but applying it in morphs with multiple lists can be 
daunting because of the use of the dependency mechanism. AFAICT the tools do not display 
dependencies and even if they did, it's not clear why some of them exist.

What is needed is a "PluggableListMorph Principles of Operation" doc, or something similar 
that can be in the Terse Guide. It should show an example of selection in one list causing the 
population of another list and selection in that list causing the population of some other 
morph. Isn't that like FileList? Yes, but we need the whys and wherefors. For example, a 
method sends #changed: with a parameter referring to another method - why? The design 
needs to be explained.

 - Dan