GDI+ How to change Line SmoothingMode?

Is it possible to change PowerPacks.LineShape smoothingMode?

I tried to use this code(a class that inherits LineShape):

  Protected Overrides Sub OnPaint(ByVal e As System.Windows.Forms.PaintEventArgs)
    Dim g As Graphics = e.Graphics   

    ' no difference when changing the SmoothingMode ' 
    g.SmoothingMode = SmoothingMode.AntiAlias 

    Using pen As New Pen(Color.Blue, 3)
      g.DrawLine(pen, X1, Y1, X2, Y2)
    End Using

    ' MyBase.OnPaint(e) '
  End Sub

I always have the same result, like this: alt text http://lh6.ggpht.com/_1TPOP7DzY1E/S3v1IbxlbCI/AAAAAAAADD4/q1Y9kP8wJ0g/s800/Capture2.png

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EDIT

updated the test:

  Protected Overrides Sub OnPaint(ByVal e As System.Windows.Forms.PaintEventArgs)
    Dim g As Graphics = e.Graphics

    Dim oldmode As SmoothingMode = g.SmoothingMode

    Using pen As New Pen(Color.Blue, 3)
      g.SmoothingMode = SmoothingMode.AntiAlias
      g.DrawLine(pen, X1, Y1, X2, Y2)
      g.SmoothingMode = SmoothingMode.None
      g.DrawLine(pen, X1 + 50, Y1, X2 + 50, Y2)
    End Using

    g.SmoothingMode = oldmode
    g.Flush()

    'MyBase.OnPaint(e)'
  End Sub

Result (don't take in consideration labels and circles):

alt text http://lh3.ggpht.com/_1TPOP7DzY1E/S447qYvTqzI/AAAAAAAADE8/eP3kCLqQJbk/s800/Capture2.png

apparently smoothing mode is not taken inconsideration...

The question was in my development mode: via Remote Desktop Connection on a virtual PC.

The RDC does not take in consideration in my case the AntiAlias graphics property.

more details: Have you had problems developing on a Virtual PC?

Thanks everybody for participating, sorry that is wasn't a really .NET problem.