Graphic

Hi, I need to make a graphic like this:

The problem is the CAPACITY line, how can I change the properties of this specific line dynamically?

If I right click on the line, I can change the properties, how can I do this in code?

thank you

Graphics graphic;
COM series, serie;
;

graphics = new Graphics();
graphics.parmActiveX(graphControl);
graphics.create();

graphControl.Gallery(3);
graphControl.Stacked(3);
graphControl.SerLegBox(true);
graphControl.Chart3D(false);
graphControl.grid(1);

series = graphControl.Series();
serie = series.get_Item(0);
serie.Gallery(1);
serie.MarkerShape(0);
serie.LineWidth(3);

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