NSTableView backed by NSArrayController: why does setContent: work while IB doesn't?
[self willChangeValueForKey:@"array"];
[self.array addObject:[NSDictionary dictionaryWithObject:@"foo" forKey:@"name"]];
[self.array addObject:[NSDictionary dictionaryWithObject:@"bar" forKey:@"name"]];
[self didChangeValueForKey:@"array"];

[arrayController addObject:[NSDictionary dictionaryWithObject:@"foo" forKey:@"name"]];
[arrayController addObject:[NSDictionary dictionaryWithObject:@"bar" forKey:@"name"]];