StoryboardCompletedTrigger (Windows Phone)
The StoryboardCompletedTrigger trigger invokes any actions that are associated with it when a storyboard has finished playing.
To add a StoryboardCompletedTrigger to a Windows Phone project
In the Assets panel, click Behaviors, and then drag the behavior that you want onto the object that you want to apply the behavior to. The Trigger category appears in the Properties panel.
In the Storyboard list, click the storyboard that you want to apply the trigger to.