How can I Have a WPF EventTrigger on a View trigger when the underlying Viewmodel dictates it should?

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Update: Firoso, as mentioned in the comments you should be able to (I think – i.e. untested) be able to use the blend behavior components to cover your requirement.

In addition to downloading and installing the SDK. Get a copy of the expression blend samples library (you’ll need to click on Downloads from the following link):
Expression Blend samples

This library contains a prebuilt trigger called ‘DataEventTrigger’ which you can use to trigger actions in response to an event declared on your viewmodel.

The blend SDK already has (from what I can tell) the other piece of the puzzle – it already includes an action which allows you to control storyboards. The name of this action is ‘ControlStoryboardAction’.

You should end up with some xaml which looks like this:

    <i:Interaction.Triggers>
        <samples:DataEventTrigger EventName="YourEvent">
            <im:ControlStoryboardAction Storyboard="{StaticResource Storyboard1}" 
                   ControlStoryboardOption="Play"/>
        </samples:DataEventTrigger>
    </i:Interaction.Triggers>

Replace ‘YourEvent’ with the name of the event you have defined on your viewmodel, and replace ‘Storyboard1’ with the name of your storyboard. Of course the names will have to match exactly.

Here are the xaml namespace definitions used:

xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity" 
xmlns:im="clr-namespace:Microsoft.Expression.Interactivity.Media;assembly=Microsoft.Expression.Interactions"
xmlns:samples="clr-namespace:Expression.Samples.Interactivity;assembly=Expression.Samples.Interactivity"

Original post, before edit:

Suggest you look into Expression Blend Behaviors:

information

Blend SDK

video on behaviors

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