Flex :: Change The Color Of An Mx:PieSeriesItem Slice Dynamically?

I am creating a program where a change in a value causes the color of a pie slice in an mx:PieChart to change dynamically.the code that is supposed to change the color is similar to this:(pieChart.pieChartSeries.items[i] as PieSeriesItem).fill = new mx.graphics.SolidColor(0,0.2); // black, almost opaquetracing out the results of this appears to apply the color to the particular PieSeriesItem, but the color does not change visually. I checked the AS reference and the fill property is of type iFill and should accept a solidColor instance. (note: I have also tried 0x000000 as a valid color, the first argument of SolidColor takes an uint)edit] Since I posted the question originally, I've added a few changes to clarify the question. am actually using an MXML component that extends < mx:PieChart > . Originally I was trying to set the color as listed above within an event handler in the main application. What I have done since then was invoke a method in my extended PieChart component, like so:

(in main applicaion)
private function someEventHandler(evt:someEvent):void{
pieChart.setPieSliceColor((pieChart.pieChartSeries.items[i] as PieSeriesItem));

[code]......