NSCollectionView inside another NSCollectionView

Question

Hi guys,

I have these two classes:

@interface Father : NSObject
{
     NSString* name;
     NSArray* listChildren;
}

@property (copy, readwrite) NSString* name;
@property (copy, readwrite) NSArray* listChildren;

@end

@interface Child : NSObject
{
     NSString* nameChild;
     NSImage* picture;
}

@property (copy, readwrite) NSString* nameChild;
@property (copy, readwrite) NSImage* picture;

@end

I'm trying to make a NSCollectionView filled with Father items, and for each father item's View i will have a name label, and another NSCollectionView filled with the (father) representedObject.listChildren items.

I've managed to create an external NIB file for the father NSCollectionViewItem's View to make things easier, but I'm not able to bind the child CollectionView to the representedObject.listChildren property. Actually, there is no problem in binding in IB, and at runtime the system is actually calling the property (I've added and getListChildren implementation and a NSLog call to make sure the property is being called). It seems that the inner CollectionView's won't load the items found in my NSArray* property?

It is driving me crazy, any ideas about what is going on? Help please!!