public static Storyboard HorizonLessenShowSb(this FrameworkElement target) { var sb = new Storyboard(); sb.AddEasyDoubleAnime(target, target.ActualWidth, 0, 0.3, "width"); sb.AddEasyThicknessAnime(target, new Thickness(2, 0, 2, 0), new Thickness(0), 0.3, "margin"); return(sb); }