How to call Storyboard in .xaml.cs ?

Question

There is a circle that has events to move along the X axis behind the bounded coordinates.

If the circle is not brought to the end of one of the final coordinates - the condition if -> it moves to the end.

BUT! Because it happens abruptly. I decided to add the animation:

<!--ANIMATED ELLIPSE TO CORNERS-->
    <Storyboard x:Key="EllipseInite">
        <DoubleAnimation To="15" Duration="00:00:4">
            <DoubleAnimation.EasingFunction>
                <ElasticEase Oscillations="1"
                             Springiness="27"
                             EasingMode="EaseOut">
                </ElasticEase>
            </DoubleAnimation.EasingFunction>
        </DoubleAnimation>
    </Storyboard>

    <Storyboard x:Key="EllipseFinite">
        <DoubleAnimation To="420" Duration="00:00:4" >
            <DoubleAnimation.EasingFunction>
                <ElasticEase Oscillations="1"
                             Springiness="27"
                             EasingMode="EaseOut">
                </ElasticEase>
            </DoubleAnimation.EasingFunction>
        </DoubleAnimation>
    </Storyboard>

The problem is that I can not understand why I can not or it is not called in Switcher (MainWindow) .xaml.cs?

public partial class Switcher : Window
    {
        public Switcher()
        {
            InitializeComponent();
        }

        bool Action = false;
        double   InitPxls = 15;
        double FinitePxls = 420;
        double Movement;
        Point Point;

        private void CircleKnob_MouseDown(object sender, MouseButtonEventArgs e)
        {
            Action = true;
            Point = Mouse.GetPosition(CircleKnob);
            Mouse.Capture(CircleKnob);
        }

        private void CircleKnob_MouseMove(object sender, MouseEventArgs e)
        {
            if (Action)
            {
                Movement = Canvas.GetLeft(CircleKnob) + Mouse.GetPosition(CircleKnob).X - Point.X;

                if (Movement > InitPxls && Movement < FinitePxls) {
                    Canvas.SetLeft(CircleKnob,   Movement);
                    Canvas.SetLeft(CircleShadow, Movement - 15);
                }
            }
        }

        private void CircleKnob_MouseUp(object sender, MouseButtonEventArgs e)
        {
            Action = false;
            Mouse.Capture(null);

            if (Movement < InitPxls + 210)
            {
                //Canvas.SetLeft(CircleKnob, InitPxls);
                //Canvas.SetLeft(CircleShadow, InitPxls - 15);
                this.Loaded += new RoutedEventHandler(InitAnimation);
            }
            else
            {
                //Canvas.SetLeft(CircleKnob, InitPxls);
                //Canvas.SetLeft(CircleShadow, InitPxls - 15);
                this.Loaded += new RoutedEventHandler(FinitAnimation);
            }
        }

        private void InitAnimation(object sender, RoutedEventArgs e) {
            Storyboard  Init = this.FindResource("EllipseInite" ) as Storyboard;
            Storyboard.SetTarget(Init, this.CircleKnob);
            Init.Begin();
        }

        private void FinitAnimation(object sender, RoutedEventArgs e)
        {
            Storyboard Init = this.FindResource("EllipseInite") as Storyboard;
            Storyboard.SetTarget(Init, this.CircleKnob);
            Init.Begin();
        }
    }

And here is the circle itself: 

<Ellipse   x:Name="CircleKnob" Width="230" Height="230"  Style="{StaticResource EllipseEffect}"
                       Fill="{StaticResource Circle}"
                       Canvas.Left="14" Canvas.Top="15"

                       MouseDown="CircleKnob_MouseDown"
                       MouseMove="CircleKnob_MouseMove"
                       MouseUp  ="CircleKnob_MouseUp"   >
</Ellipse>