Dim p As New Drawing2D.GraphicsPath()
p.StartFigure()
p.AddArc(New Rectangle(0, 0, 40, 40), 180, 90)
p.AddLine(40, 0, Me.Width - 40, 0)
p.AddArc(New Rectangle(Me.Width - 40, 0, 40, 40), -90, 90)
p.AddLine(Me.Width, 40, Me.Width, Me.Height - 40)
p.AddArc(New Rectangle(Me.Width - 40, Me.Height - 40, 40, 40), 0, 90)
p.AddLine(Me.Width - 40, Me.Height, 40, Me.Height)
p.AddArc(New Rectangle(0, Me.Height - 40, 40, 40), 90, 90)
p.CloseFigure()
Me.Region = New Region(p)
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