Moving up element failed in doubleanimation WPF VB.NET

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VB

.NET

WPF

Hi.
I made an element in WPF and its name is "MyRecElem"
I need to move up the element on the page.
I used below code.
But no luck.
Any kindly help please?

What I have tried:

Private Sub btnStartMoving_Click(sender As Object, e As RoutedEventArgs) Handles btnStartMoving.Click

        'Move up the MyRecElem which is the element I need to move up.
        Dim DAMyRecElem = New DoubleAnimation With {
            .From = 3,
            .To = 150,
            .FillBehavior = FillBehavior.HoldEnd,
            .BeginTime = TimeSpan.FromSeconds(0),
            .Duration = New Duration(TimeSpan.FromSeconds(1)),
            .EasingFunction = New PowerEase With {
                        .EasingMode = EasingMode.EaseOut
                    }}
        Dim storyboardMyRecElem = New Storyboard()
        Storyboard.SetTarget(DAMyRecElem, MyRecElem)
        Storyboard.SetTargetProperty(DAMyRecElem, New PropertyPath(TranslateTransform.YProperty))
        storyboardMyRecElem.Children.Add(DAMyRecElem)
        storyboardMyRecElem.Begin()

End Sub