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+1  Q: 

Listen to the PropertyChanged event of any item in an ObservableCollection<INotifyPropertyChanged>

I've created a wrapper collection for ObservableCollection that subscribes to each items PropertyChanged event and rethrows it as its own event ItemPropertyChanged. I did this using a similar method to what I described here. Is there a better way? Am I missing another .NET collection that already has this type of behavior?

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