gistfile1.m

@interface MyViewController : NSViewController <NSCollectionViewDelegate>
{
    IBOutlet NSCollectionView	*collectionView;
    IBOutlet NSArrayController	*arrayController;
    NSMutableArray *images;
    
    NSUInteger sortingMode;
    BOOL alternateColors;
    
    NSArray *savedAlternateColors;
}

@property(retain) NSMutableArray *images;
@property(assign) NSUInteger sortingMode;
@property(assign) BOOL alternateColors;

- (void)doubleClick:(id)sender;

@end