> 
> I write the following code and try to observe the window miniaturized 
> notification, it doesn't work, can anyone tell me why?
> ...
> // Observing window status
>       [self registerDefaultNotification:NSWindowDidMiniaturizeNotification 
> withSelector:@selector(windowMiniaturized:) onObject:nil];
> 

with "onObject:nil" you are not providing an NSWindow instance to observe

Jim
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