Storyboard.Begin Method (FrameworkElement)
Applies the animations associated with this Storyboard to their targets and initiates them.
Assembly: PresentationFramework (in PresentationFramework.dll)
If the targeted properties are already animated, they are replaced using the SnapshotAndReplace handoff behavior.
Storyboards started with this method cannot be paused, resumed, or otherwise interactively controlled after they are started. To make a storyboard controllable, use the Begin(FrameworkElement, Boolean) or Begin(FrameworkElement, HandoffBehavior, Boolean) method.