Why is BindingListCollectionView sealed? [closed]

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I have an extension to the ICollectionView interface that allows me to handle multi-selection (IMultiSelectCollectionView). I want to provide an implementation that is compatible with BindingListCollectionVi开发者_开发问答ew but that class is sealed. Does anyone know why this design decision was made?

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Sealing a class usually denotes a safeguard to a derived class that might dramatically change the basic behavior of the original one. Anyway, I don't know what's the real meaning for sealing that class.