Public Sub New()
    Me.WindowTitle = "Rotate About Center Example"
    NameScope.SetNameScope(Me, New NameScope())
    Dim myStackPanel As New StackPanel()
    myStackPanel.Margin = New Thickness(50)

    Dim myButton As New Button()
    myButton.Name = "myRenderTransformButton"
    Me.RegisterName(myButton.Name,myButton)
    myButton.RenderTransformOrigin = New Point(0.5,0.5)
    myButton.HorizontalAlignment = HorizontalAlignment.Left
    myButton.Content = "Hello World"


    Dim myRotateTransform As New RotateTransform(0)
    myButton.RenderTransform = myRotateTransform
    Me.RegisterName("MyAnimatedTransform",myRotateTransform)

    myStackPanel.Children.Add(myButton)

    '
    ' Creates an animation that accelerates through 40% of its duration and
    '      decelerates through the 60% of its duration.
    '
    Dim myRotateAboutCenterAnimation As New DoubleAnimation()
    Storyboard.SetTargetName(myRotateAboutCenterAnimation,"MyAnimatedTransform")
    Storyboard.SetTargetProperty(myRotateAboutCenterAnimation,New PropertyPath(RotateTransform.AngleProperty))
    myRotateAboutCenterAnimation.From = 0.0
    myRotateAboutCenterAnimation.To = 360
    myRotateAboutCenterAnimation.Duration = New Duration(TimeSpan.FromMilliseconds(1000))

    ' Create a Storyboard to contain the animations and
    ' add the animations to the Storyboard.
    Dim myStoryboard As New Storyboard()
    myStoryboard.Children.Add(myRotateAboutCenterAnimation)

    ' Create an EventTrigger and a BeginStoryboard action to
    ' start the storyboard.
    Dim myEventTrigger As New EventTrigger()
    myEventTrigger.RoutedEvent = Button.ClickEvent
    myEventTrigger.SourceName = myButton.Name
    Dim myBeginStoryboard As New BeginStoryboard()
    myBeginStoryboard.Storyboard = myStoryboard
    myEventTrigger.Actions.Add(myBeginStoryboard)
    myStackPanel.Triggers.Add(myEventTrigger)

    Me.Content = myStackPanel
End Sub