LineChart: How to have fixed interval on X-axis

Question

Hi All,
I am flex newbie. I am trying to figureout how to have fixed interval (say 7) of X-axis in a LineChart. I have tried AxisRenderer, CategoryAxis and DateAxis to no avail. Can you refer to an example or a snippet which would help to resolve this problem.I have pasted my code here below. Thanks in advance.
<mx:LineChart 
id="DOLoginGraph" dataProvider="{doLoginGraphData}" paddingTop="10" width="100%" height="100%"
showDataTips="
true" backgroundElements="{gridLinesDOL}" >
<!-- vertical Value axis -->
<mx:verticalAxis>
<mx:LinearAxis baseAtZero="true" maximum="40" interval="10" />
</mx:verticalAxis>
<!-- Horizontal Date axis -->
<mx:horizontalAxis>
<mx:CategoryAxis id="horiDateAxis" categoryField="date" />
</mx:horizontalAxis>
<mx:horizontalAxisRenderers>
<mx:AxisRenderer placement="bottom" axis="{horiDateAxis}"/>
</mx:horizontalAxisRenderers>
<!-- Series -->
<mx:series>
<mx:LineSeries yField="value"  showDataEffect="{chartEffect}" form="curve" displayName="Open" >
<mx:lineStroke>
<mx:SolidColorStroke color="#32cd32" weight="2" alpha=".8"/>
</mx:lineStroke>
</mx:LineSeries>
</mx:series>
</mx:LineChart>

Answer 1

LinearAxis:
    //  interval
     *  @private
    private var _userInterval:Number;
    [Inspectable(category="General")]
     *  Specifies the numeric difference between label values along the axis.
     *  Flex calculates the interval if this property
     *  is set to <code>NaN</code>. 
     *  The default value is <code>NaN</code>.
     *  @langversion 3.0
     *  @playerversion Flash 9
     *  @playerversion AIR 1.1
     *  @productversion Flex 3
    public function get interval():Number
        return computedInterval;
     *  @private
    public function set interval(value:Number):void
        if (value <= 0)
            value = NaN;
        _userInterval = value;
        computedInterval = value;
        invalidateCache();
        dispatchEvent(new Event("axisChange"));