[ValueToPixel Function Always return 0 In Radar Chart]

private void chart1_PostPaint(object sender, ChartFX.WinForms.CustomPaintEventArgs e)

 {

 int orgX = chart1.ChartAreaRectangle.Width / 2;

  int orgY = chart1.ChartAreaRectangle.Height / 2;

int cy = chart1.AxisY.ValueToPixel(30);  ==> Always return 0;

// I Want DrawCircle (OrgX,OrgY and cy size  )

 }

[ValueToPixel Function Always return 0 In Radar Chart]

 ValueToPixel Function Always return 0 in Radar Chart.

How Can I  this Value?

I Want Draw Circle in PostPaint function.