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    <p>There is no reason to subclass <code>NSNotification</code> the way you're describing. First, <code>NSNotification</code> already carries a userInfo dictionary. You can put any data you want in there. You can use category methods to read and write into that dictionary if you like (I do this all the time). For example, a very common thing I want to do is pass along some object, say the <code>RNMessage</code>. So I create a category that looks like this:</p> <pre><code>@interface NSNotificationCenter (RNMessage) - (void)postNotificationName:(NSString *)aName object:(id)anObject message:(RNMessage *)message; @end @interface NSNotification (RNMessage) - (RNMessage *)message; @end </code></pre> <hr> <pre><code>static NSString * const RNMessageKey = @"message"; @implementation NSNotificationCenter (RNMessage) - (void)postNotificationName:(NSString *)aName object:(id)anObject message:(RNMessage *)message { [self postNotificationName:aName object:anObject userInfo:[NSDictionary dictionaryWithObject:message forKey:RNMessageKey]; } @end @implementation NSNotification (RNMessage) - (RNMessage *)message { return [[self userInfo] objectForKey:RNMessageKey]; } </code></pre> <p>As @hypercrypt notes, you can also use associated references to attach data to any arbitrary object without creating an ivar, but with <code>NSNotification</code> it's much simpler to use the userInfo dictionary. It's much easier to print notification using <code>NSLog</code>. Easier to serialize them. Easier to copy them. Etc. Associated references are great, but they do add lots of little corner cases that you should avoid if you can get away with it.</p>
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    1. COVery nice. This is really helpful. Much appreciated.
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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