change the width, color, and alpha of the axis line with the tag.
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<!-- charts/StyleAxisLines.mxml -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
<mx:Script>
import mx.collections.ArrayCollection;
[Bindable]
public var expenses:ArrayCollection = new ArrayCollection([
{Month:"Jan", Profit:2000, Expenses:1500, Amount:450},
{Month:"Feb", Profit:1000, Expenses:200, Amount:600},
{Month:"Mar", Profit:1500, Expenses:500, Amount:300}
]);
</mx:Script>
<mx:Stroke id="axisStroke" color="#884422" weight="8" alpha=".75"
caps="square" />
<mx:Panel title="Line Chart">
<mx:LineChart dataProvider="{expenses}" showDataTips="true">
<mx:horizontalAxis>
<mx:CategoryAxis dataProvider="{expenses}"
categoryField="Month" />
</mx:horizontalAxis>
<mx:horizontalAxisRenderer>
<mx:AxisRenderer>
<mx:axisStroke>{axisStroke}</mx:axisStroke>
</mx:AxisRenderer>
</mx:horizontalAxisRenderer>
<mx:verticalAxisRenderer>
<mx:AxisRenderer>
<mx:axisStroke>
<mx:Stroke color="#884422" weight="8"
alpha=".75" caps="square" />
</mx:axisStroke>
</mx:AxisRenderer>
</mx:verticalAxisRenderer>
<mx:series>
<mx:LineSeries yField="Profit" displayName="Profit" />
<mx:LineSeries yField="Expenses" displayName="Expenses" />
</mx:series>
</mx:LineChart>
</mx:Panel>
</mx:Application>
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