How do I alternate labeling tickmarks on a linechart?

i want x-axis have tickmark labels every 3 tickmarks this:

_60____63____66____69____72____75____78_


what default this:

__60_61_62_63_64_65_66_67_68_69_70_71_72_73_74_75_76_77_78


any appreciated

tony

interval=4

<?xml version="1.0"?>
<mx:application xmlns:mx=" http://www.adobe.com/2006/mxml">
<mx:script><![cdata[
import mx.collections.arraycollection;
[bindable]
public var ac:arraycollection = new arraycollection([
{year:2000, profit:2100}, {year:2001, profit:2020},
{year:2002, profit:2300}, {year:2003, profit:2040},
{year:2004, profit:2500}, {year:2005, profit:2600},
{year:2006, profit:2770}, {year:2007, profit:2800},
{year:2008, profit:2900}, {year:2009, profit:2990}
]);
]]></mx:script>
<mx:panel title="line chart">
<mx:linechart id="lc" dataprovider="{ac}">
<mx:horizontalaxis>
<mx:linearaxis baseatzero="false" interval="2"/>
</mx:horizontalaxis>
<mx:series>
<mx:lineseries yfield="profit" displayname="profit"/>
</mx:series>
</mx:linechart>
<mx:legend dataprovider="{lc}"/>
</mx:panel>
</mx:application>

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