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That works perfectly. Many thanks.
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I've tried implementing this for a simlilar requirement, but find that it interferes with "Undo" operations - CanSave and CanUndo (of ViewModel<Parent>) remain true after undo completes: Even if there is nothing to undo in the child collection, OnChildChanged is invoked many times during Undo operation (number of items + 1) and using
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After spending a couple of months playing with MVVM and thinking that what I wanted to do was combine CSLA with an MVVM framework, I have come to the conclusion that: 1. Many available MVVM Frameworks require more plumbing code to make them work than is needed to implement the Models (Business Objects) - they are just too complex; 2. The CSLA ViewModel