Getting started with MVC

I'm trying to make the transition (from delegates and data sources) but 
have gotten stuck. I have parent object which contains several arrays.

The object in one array is has a member that is also has an array which 
I had represented as an outline. There's where I'm stuck.

The application is a scheduler with objects like this:

     site - parent object
       rooms - array of 'room' objects
       venues - array of 'schedule' objects

     schedule    - parent object of array of agenda objects

     agenda      - object contains a date and array of time objects

The agenda 'date' object is separated from the time (really a date 
object as well) so that the date can be manipulated apart from the times 
array.

So for a given site, each room can be signed out to a given venue which 
minimally contains at least 1 schedule object. Each schedule is 
minimally offered on at least 1 agenda object. The agenda object details 
information like the date for the program or event, and the times (can 
be multiple) it's offered that day.

So far I have these bindings which work;

     Rooms - NSArrayController
     BindTo: ControllerAlias
     Key:    selection
     Model:  rooms

     Venues - NSArrayController
     BindTo: ControllerAlias
     Key:    selection
     Model:  venues

But how to make the linkage for the agendas? I believe this should be a 
tree controller, since the agenda is presented as an outline:

     Agenda - NSTreeController
     BindTo:  Venues
     Key:     selection
     Model:   venue

But alas my outline is empty so I suspect I'm doing something wrong. Or 
it could be I need still more to read (NSManagedObject)?  Btw, the 
parent object site I had instantiated in IB and linked my window 
controller to it; this macho controller governs all but has become too 
big which led me to the MVC migration in the first place.

Also, how / can you intercept the 'add','remove', etc. methods? In my 
model each requires at least 1 of each element, and when adding new 
elements I may need the ability to offset some fields so that there's no 
date / time overlap for a given room or site.
-- 
/los  "I was a teenage net-random."

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Carlos D. Santiago                              Phone: 516/447-7368
Oracle Cor****ation                             Mobile: 516/446-9902
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