Well, I fought for a while getting a chart that didn't have ANY gaps on the sides. It was tricky, but I thought I'd share my solution for posterity.
<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" backgroundColor="green" borderColor="blue" borderStyle="solid" borderThickness="5" paddingBottom="0" paddingLeft="0" paddingRight="0" paddingTop="0" > <mx:CartesianChart id="chart1" width="100%" height="100%" gutterLeft="0" > <mx:dataProvider> <mx:Array> <mx:Object x="0" y="1"/> <mx:Object x="1" y="3"/> <mx:Object x="2" y="2"/> </mx:Array> </mx:dataProvider> <mx:horizontalAxis> <mx:LinearAxis/> </mx:horizontalAxis> <mx:verticalAxis> <mx:LinearAxis/> </mx:verticalAxis> <mx:horizontalAxisRenderer> <mx:AxisRenderer showLabels="false" showLine="false" tickPlacement="none" labelGap="0"> <mx:tickStroke> <mx:Stroke weight="0"/> </mx:tickStroke> </mx:AxisRenderer> </mx:horizontalAxisRenderer> <mx:verticalAxisRenderer> <mx:AxisRenderer showLabels="false" showLine="false" tickPlacement="none" labelGap="0"> <mx:tickStroke> <mx:Stroke weight="0"/> </mx:tickStroke> <mx:minorTickStroke> <mx:Stroke weight="0"/> </mx:minorTickStroke> </mx:AxisRenderer> </mx:verticalAxisRenderer> <mx:series> <mx:AreaSeries xField="x" yField="y"/> </mx:series> </mx:CartesianChart> </mx:Application> -- Jason