Created attachment 973 [details]
example of incorrect drawing of the gradient

If you set an area series to have a gradient, it does not draw it correctly.

Using a .NET 5 console application with the latest Steema.TeeChart.NET NuGet package (4.2021.6.23), the following code will demonstrate the issue. Regardless of what you set the gradient settings, it always draws the same. What it draws does not seem to match any of the available options.

            var chart = new TChart();
            var area = new CustomArea();
            area.Add(1, 1);
            area.Add(2, 2);
            area.Add(3, 5);
            area.AreaBrush.Gradient.Visible = true;
            area.AreaBrush.Gradient.Direction = LinearGradientMode.Vertical;
            chart.Series.Add(area);
            chart.Export.Image.PNG.Width = 800;
            chart.Export.Image.PNG.Height = 600;
            chart.Export.Image.PNG.Save("test.png");

I've attached an example image of what I get when executing this code.