protected override void OnRender(ChartControl chartControl, ChartScale chartScale)
{
  base.OnRender(chartControl, chartScale);
 
  // Trigger an alert when the Overlay scale justification is used
  if (ChartPanel.IsYAxisDisplayedOverlay)
      Alert("overlayAlert", Priority.Low, "It is not recommended to use 'Overlay' with this indicator", "", 300, Brushes.Yellow, Brushes.Black);
}