Hi Karl,
In order to hide the border you need to use the following code:
nChartControl1.BackgroundStyle.FrameStyle.Visible = false;
Regarding the background - do you need to change the background of the plot or the background of the control:
1. To change the background of the of the control use:
nChartControl1.BackgroundStyle.FillStyle = new NColorFillStyle(Color.Black);
2. To change the background of the plot you can use:
nChartControl1.Charts[0].BackgroundFillStyle = new NColorFillStyle(Color.Black);
Hope this helps - let us know if you have any questions.
Best Regards,
Nevron Support Team