How to call Storyboard in .xaml.cs ?

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:

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>

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