Hi Jarrod,
You need to assign the CustomColors array and set the Palette to Custom.
this.chartControl1.Model.ColorModel.CustomColors = new Color[]{Color.Green,Color.Blue,Color.Wheat,Color.AliceBlue,Color.Orange};
this.chartControl1.Model.ColorModel.Palette = ChartColorPalette.Custom;
Please refer to the sample linked to below:
ChartPieColors_1833.zip
Regards,
Davis