/// <summary>
/// Core update routine.
/// </summary>
/// <param name="context">The context that holds information about the animation.</param>
protected override void UpdateAnimationOverride(AnimationContext context)
{
double duration = this.Duration.TimeSpan.TotalSeconds;
double startWidth = GetWidth(context.Target, this.StartWidth);
double endWidth = GetWidth(context.Target, this.EndWidth);
context.EnsureDefaultTransforms();
context.Width(0, startWidth, duration, endWidth);
if (this.Height.HasValue)
{
(context.Target as FrameworkElement).Height = this.Height.Value;
}
base.UpdateAnimationOverride(context);
}