Is there a way to begin a storyboard wen an ICommand is executed WITH XAML?
RoutedCommands involve some code-behind, but this is definitely doable.
The simplest way is to add a CommandBinding to the parent control. Something like this:
<UserControl>
<UserControl.CommandBindings>
<CommandBinding Command="ApplicationCommands.Exit" Executed="HandleExit"/>
</UserControl.CommandBindings>
</UserControl>
Then in your code-behind event handler named 'HandleExit', invoke the storyboard either by name or from the Resources collection.
Let me know if you need some more clarification.