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mvvm light MIX10 demo RelayCommand question

Hi there,

Has anyone seen Laurent Bugnion's great demo at MIX10? If you are into MVVM-light I would call it a must see, I do have a question that I can't see to figure out... In the demo that uses RelayCommand, he does two examples - one where we implement Icommand itself and one where use RelayCommand from MVVM Light. On the second example he specifically says that you need to call RaiseCanExecuteChanged in the on the SayHello command when the Counter property changes. but I commented this out and it works...

Sorry - you have to be familiar with the demo to get this question but I hope someone might be... I also hope someone can clear this up - I don't seem to know why we need to do what he is talking about cause it works just fine otherwise.

Thanks!!!

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