public override void OnBeforePaint(NPanel panel, NPanelPaintEventArgs eventArgs)
{
NChart chart = panel as NChart;
NRange1DD rulerRange = chart.Axis(StandardAxis.PrimaryY).Scale.RulerRange;
NLabel label = new NLabel();
label.Location = new NPointL(new NLength(100, NRelativeUnit.ParentPercentage), new NLength(0, NRelativeUnit.ParentPercentage));
label.ContentAlignment = ContentAlignment.BottomLeft;
label.TextStyle.FontStyle.EmSize = new NLength(10);
label.Text = " Min[" + rulerRange.Begin + "] Max[" + rulerRange.End + "]";
chart.ChildPanels.Add(label);
chart.RecalcLayout(eventArgs.Context);
}