Dynamic Animation for Dynamic Frame

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WPF

How can i give this Animation for a Dynamic Frame

void DoAnimation(DependencyObject obj)
       {
           var sb = new Storyboard();

           var da1 = new DoubleAnimationUsingKeyFrames();
           da1.KeyFrames.Add(new SplineDoubleKeyFrame { KeyTime = KeyTime.FromTimeSpan(TimeSpan.FromMilliseconds(0)), Value = 1 });
           da1.KeyFrames.Add(new SplineDoubleKeyFrame { KeyTime = KeyTime.FromTimeSpan(TimeSpan.FromMilliseconds(15)), Value = 0, KeySpline = new KeySpline(0,0,0.4,0.969) });
           Storyboard.SetTargetProperty(obj, new PropertyPath("(UIElement.Opacity)"));
           Storyboard.SetTarget(da1, obj);
           sb.Children.Add(da1);

           var da3 = new DoubleAnimationUsingKeyFrames();
           da3.KeyFrames.Add(new SplineDoubleKeyFrame { KeyTime = KeyTime.FromTimeSpan(TimeSpan.FromMilliseconds(0)), Value = 1 });
           da3.KeyFrames.Add(new SplineDoubleKeyFrame { KeyTime = KeyTime.FromTimeSpan(TimeSpan.FromMilliseconds(15)), Value = 0.8, KeySpline = new KeySpline(0, 0, 0.4, 0.969) });
           da3.KeyFrames.Add(new SplineDoubleKeyFrame { KeyTime = KeyTime.FromTimeSpan(TimeSpan.FromMilliseconds(15)), Value = 1 });
           da3.KeyFrames.Add(new SplineDoubleKeyFrame { KeyTime = KeyTime.FromTimeSpan(TimeSpan.FromMilliseconds(25)), Value = 1 });
           Storyboard.SetTargetProperty(da3, new PropertyPath("(UIElement.RenderTransform).(TransformGroup.Children)[0].(ScaleTransform.ScaleX)"));
           Storyboard.SetTarget(da3, obj);
           sb.Children.Add(da3);

           var da5 = new DoubleAnimationUsingKeyFrames();
           Storyboard.SetTargetProperty(da5, new PropertyPath("(UIElement.RenderTransform).(TransformGroup.Children)[0].(ScaleTransform.ScaleY)"));
           Storyboard.SetTarget(da5, obj);
           da3.KeyFrames.Add(new SplineDoubleKeyFrame { KeyTime = KeyTime.FromTimeSpan(TimeSpan.FromMilliseconds(0)), Value = 1 });
           da3.KeyFrames.Add(new SplineDoubleKeyFrame { KeyTime = KeyTime.FromTimeSpan(TimeSpan.FromMilliseconds(15)), Value = 0.8, KeySpline = new KeySpline(0, 0, 0.4, 0.969) });
           da3.KeyFrames.Add(new SplineDoubleKeyFrame { KeyTime = KeyTime.FromTimeSpan(TimeSpan.FromMilliseconds(15)), Value = 1 });
           da3.KeyFrames.Add(new SplineDoubleKeyFrame { KeyTime = KeyTime.FromTimeSpan(TimeSpan.FromMilliseconds(25)), Value = 1 });
           sb.Children.Add(da5);

           sb.Begin();
       }

I am creating a dynamic Frame . How can i give this animation for a dynamic frame .

Please help me