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Why are commands only usable with some views? Why not others?

aormsbyaormsby USMember ✭✭

I'm just curious to know more about this. For example, why can I add a command to a Button in XAML, but I can't add one to a picker on selection? Maybe I answer my own question by saying that selection is more of an event, but I guess I'm wondering why I need to trigger an event as opposed to having the ability to trigger a command.

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