One Quickie

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Receiving notifications (Notifications->General)

NSNotificationCenter *center;
center = [NSNotificationCenter defaultCenter];

[center addObserver: self
        selector: @selector(groupVisualChange:)
        name: BWStitchGroup_VisualAttributeChangeNotification
        object: group];

Where the selector looks like this:

- (void) groupVisualChange: (NSNotification *) notification
{
    // do stuff with the notification
} // groupVisualChange