The following example shows how you can change the line colors in a LineChart in Flex by setting the lineStroke style in MXML or ActionScript, as seen in the following snippets: MXML: <mx:LineSeries id="closeSeries" yField="@close" form="curve" displayName="Close"> <mx:lineStroke> <mx:Stroke color="haloGreen" weight="2" alpha="0.6" /> </mx:lineStroke> </mx:LineSeries> ActionScript: <mx:LineSeries