there are many ways of accomplishing this.  the OP was using the Series collection, so he simply added a PaintElement to the PEs collection of each series.

if you're using the DataSource property instead of the Series collection, the simplest way to do this is to set the ColorModel.ModelStyle to CustomLinear and then set ColorModel.CustomPalette to an array of colors.

I have the same problem now, Can you please explain how you got this working.

Thanks.