void Login_DongHua(object sender, RoutedEventArgs e)
        {
            this.donghua.RenderTransform = new TranslateTransform();

            this.donghua.Name = "donghua";
            this.Name = "Login";
            NameScope.SetNameScope(this, new NameScope());
            this.RegisterName(this.donghua.Name, this.donghua);

            DoubleAnimation xAnimation = new DoubleAnimation();
            xAnimation.From = 0;
            xAnimation.To = -160;
            xAnimation.Duration = new Duration(TimeSpan.FromSeconds(2));

            DependencyProperty[] propertyChain = new DependencyProperty[]
            {
                Button.RenderTransformProperty,
                TranslateTransform.XProperty
            };

            Storyboard story = new Storyboard();
            story.AutoReverse = true;
            story.RepeatBehavior = RepeatBehavior.Forever;
            story.Children.Add(xAnimation);

            Storyboard.SetTargetName(xAnimation, this.donghua.Name);
            Storyboard.SetTargetProperty(xAnimation, new PropertyPath("(0).(1)", propertyChain));

            story.Begin(this);
        }