use the secondHorizontalAxisRenderer and secondVerticalAxisRenderer properties to control the appearance of the secondary axis
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<!-- charts/MultipleAxesMultipleRenderers.mxml -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" width="600"
height="600">
<mx:Script>
[Bindable]
public var SMITH:Array = [
{date: "22-Aug-05", close: 45.87},
{date: "23-Aug-05", close: 45.74},
{date: "24-Aug-05", close: 45.77},
{date: "25-Aug-05", close: 46.06},
];
[Bindable]
public var DECKER:Array = [
{date: "22-Aug-05", close: 157.59},
{date: "23-Aug-05", close: 157.3},
{date: "24-Aug-05", close: 156.71},
{date: "25-Aug-05", close: 156.88},
];
</mx:Script>
<mx:Panel title="Chart" width="400" height="400">
<mx:ColumnChart id="mychart" dataProvider="{SMITH}"
secondDataProvider="{DECKER}" showDataTips="true" height="250"
width="350">
<mx:horizontalAxis>
<mx:CategoryAxis dataProvider="{SMITH}"
categoryField="date" />
</mx:horizontalAxis>
<mx:verticalAxis>
<mx:LinearAxis minimum="30" maximum="50" />
</mx:verticalAxis>
<mx:series>
<mx:ColumnSeries dataProvider="{SMITH}" xField="date"
yField="close" displayName="SMITH" />
</mx:series>
<mx:secondVerticalAxis>
<mx:LinearAxis minimum="150" maximum="170" />
</mx:secondVerticalAxis>
<mx:verticalAxisRenderer>
<mx:AxisRenderer placement="right"
tickPlacement="inside">
<mx:axisStroke>
<mx:Stroke color="#CC6699" weight="1" />
</mx:axisStroke>
<mx:tickStroke>
<mx:Stroke color="#CC0099" weight="1" />
</mx:tickStroke>
<mx:minorTickStroke>
<mx:Stroke color="#990066" weight="1" />
</mx:minorTickStroke>
</mx:AxisRenderer>
</mx:verticalAxisRenderer>
<mx:secondVerticalAxisRenderer>
<mx:AxisRenderer placement="left"
tickPlacement="inside">
<mx:axisStroke>
<mx:Stroke color="#000080" weight="1" />
</mx:axisStroke>
<mx:tickStroke>
<mx:Stroke color="#000160" weight="1" />
</mx:tickStroke>
<mx:minorTickStroke>
<mx:Stroke color="#100040" weight="1" />
</mx:minorTickStroke>
</mx:AxisRenderer>
</mx:secondVerticalAxisRenderer>
<mx:secondSeries>
<mx:LineSeries dataProvider="{DECKER}" xField="date"
yField="close" displayName="DECKER" />
</mx:secondSeries>
</mx:ColumnChart>
</mx:Panel>
</mx:Application>
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