How to play Storyboard in ViewModel?

Question

I defiend a storyborad in View

Answer 1

You could call the Storyboard from a code-behind as long as you assigned it x:Name. But then, you'd need to implement a button_click event handler, not a command for the ViewModel.

If you're using MVVM then you should really abide by the principle that the ViewModel should not "know" about specifics of the View.