' Respond to the left mouse button down event by initiating the hit test.
        Private Overloads Sub OnMouseLeftButtonDown(ByVal sender As Object, ByVal e As MouseButtonEventArgs)
            ' Retrieve the coordinate of the mouse position.
            Dim pt As Point = e.GetPosition(CType(sender, UIElement))

            ' Perform the hit test against a given portion of the visual object tree.
            Dim result As HitTestResult = VisualTreeHelper.HitTest(myCanvas, pt)

            If result IsNot Nothing Then
                ' Perform action on hit visual object.
            End If
        End Sub

// Respond to the left mouse button down event by initiating the hit test.
private void OnMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    // Retrieve the coordinate of the mouse position.
    Point pt = e.GetPosition((UIElement)sender);

    // Perform the hit test against a given portion of the visual object tree.
    HitTestResult result = VisualTreeHelper.HitTest(myCanvas, pt);

    if (result != null)
    {
        // Perform action on hit visual object.
    }
}