HitTestResultCallback & HitTestParameters3D of VisualTreeHelper.HitTest

Hi, I am trying to create a 3D HitTest:

Code:

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    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles Button3.Click

        Dim reference As Visual3D
        Dim filterCallback As HitTestFilterCallback
        'Dim resultCallback As HitTestResultCallback
        Dim hitTestParameters As HitTestParameters3D

        Dim resultCallback As New HitTestResultCallback(AddressOf HandlerMethod)

        hitTestParameters = New Point3D(0, 0, 0)

        VisualTreeHelper.HitTest(V.Children.Item(0), Nothing, resultCallback,  Point3D(V.Children.Item(0).Transform.Value.OffsetX, V.Children.Item(0).Transform.Value.OffsetY, V.Children.Item(0).Transform.Value.OffsetZ))

    End Sub

    Function HandlerMethod() As Object

        Return Nothing

    End Function

    Function hitTestParameters() As Point3D

        Dim Point As Point3D = New Point3D(V.Children.Item(0).Transform.Value.OffsetX, V.Children.Item(0).Transform.Value.OffsetY, V.Children.Item(0).Transform.Value.OffsetZ)

        Return Point

    End Function

Q

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I am having trouble with the HitTestResultCallback and HitTestParameters3D parameters of the VisualTreeHelper.HitTest function above.

Any help is appreciated.

Thanks