Problem in WPF Animation Custom Control

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C#

VB

WPF

animation

controls

event

My app has a custom user control (an ellipse with animation.) In my main window, I use both the usercontrol and a button
Image of the Control
I need to animate the control when the button is pressed:

private void button1_Click(object sender, RoutedEventArgs e)
    {
        for (int i = 0; i < 10; i++)
        {
            userControl11.BlueAnimate();
            dowork1();
            userControl11.RedAnimate();
            dowork2();
        }
    }

in my xml of the control i have the following definition:

<UserControl.Resources>
    <Storyboard x:Name="Ellipse1Animation" x:Key="Ellipse1Animation">
        <DoubleAnimation
            x:Name="AnimacionEllipse"
            Storyboard.TargetName="_Ellipse"
            Storyboard.TargetProperty="Opacity"
            From="0.0" To="1.0" Duration="0:0:1"
            AutoReverse ="True"
            RepeatBehavior="Forever"
            />
    </Storyboard>
</UserControl.Resources>

The userControl11.BlueAnimate(); has the following code (It is almost the same for the other method; the only change is the color cast.)

Public Sub BlueAnimate()
       Dim AnimJob As Action = Function()
              Dispatcher.Invoke(DirectCast(
                         Function()
                         Dim sb As Storyboard = FindResource("Ellipse1Animation")
                         Dim Anim As DoubleAnimation = sb.Children(0)
                         _Ellipse.Fill = Brushes.Blue
                         Storyboard.SetTargetName(Anim, "_Ellipse")
                         sb.Beging()
              End Function, Action))
              End Function
       Task.Factory.StartNew(AnimJob )
   End Sub

When I cast the userControl11.BlueAnimate, it doesn't change. The visual interface stays frozen and doesn't work. Can someone help?

Thanks for your time.