How can I Databind to a Sealed Class?

Wrapping the class in a view model that provides notification (and maybe validation, editing support etc.) is the usual approach. The question is whether the underlying object is modified elsewhere in your process and, if so, whether you want those changes to be automatically reflected in the UI. If you do, you'll need a more centralized approach - usually by way of a service that manages those objects.

If the binding is for reading only you can get away with not implementing INotifyPropertyChanged and just having the binding.

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