Event where TPen and TBrush used for drawing chart lines or bars can be set to different values than one set in LinePen and FillBrush properties.

property OnChartColor: TNxChartColorEvent read FOnChartColor write FOnChartColor;

Example

procedure TForm1.NxChartColumn61ChartColor(Sender: TObject; Index: Integer;
  var BorderColor, FillColor: TColor);
begin
  if Data[Index] > 5 then
    FillColor := RGB(68, 114, 196)
  else if Data[Index] < 0 then
    FillColor := RGB(237, 125, 49)
  else FillColor := RGB(165, 165, 165);
  BorderColor := FillColor;
end;