Failing to unhook Anonymous Delegates can cause real issues.

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The ViewModel is supposed to supplement the functionality provided by the Model, and coerce it into a form the View can more readily consume. The result being; the View code can be pretty thin and concerned only with view based activities, while the Model can remain uncompromising by the demands placed on it by a View meaning it can better represent ......

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The MVVM (Model-View-ViewModel ) Design Pattern requires that you create a facade layer between the Model and the View called the ViewModel. Now lets look at how this works in real life...

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When you call clear on the list the ObservableCollection, the CollectionChanged event is fired with the action set to Reset, BUT the OldItems list is empty.

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