Once the animation is stopped, call Start to restart the animation.

Note that calling the method Stop (or one of its overloads) has no effect if the animation controller is invalid.

Important: When animations are started or stopped the animations do not take effect immediately. That means the new animation values are not immediately applied to the properties that are being animated. The animations are evaluated when the animation system is updated (see Update(TimeSpan)) and new animation values are written when ApplyAnimations is called.

The method UpdateAndApply can be called to immediately evaluate and apply the animation. But in most cases it is not necessary to call this method explicitly.

Reference