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  1. PO
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    <p>Yep, it's a bug in AreaSeries. Due to the stupid way that flex charts are designed, the only real way to fix it is to set a custom <code>dataTipFunction</code> on the AreaChart.</p> <p>Here's a copy of the relevant code with the bug fixed:</p> <pre><code>/** * Create a data tip function for the given AreaSeries. Uses a copy of * the formatDataTip code from AreaSeries with the minValue bug fixed. * * @param series * @return a data tip function * */ private function createAreaSeriesTipFunc(series:AreaSeries):Function { var displayName:String = series.displayName; var dataTransform:DataTransform = series.dataTransform; var xField:String = series.xField; var minField:String = series.minField; // formatDataTip relies on AreaSeries member data so simulate that // with a closure to minimize code modifications return function(hd:HitData):String { var dt:String = ""; var n:String = displayName; if (n &amp;&amp; n != "") dt += "&lt;b&gt;"+ n + "&lt;/b&gt;&lt;BR/&gt;"; var xName:String = dataTransform.getAxis(CartesianTransform.HORIZONTAL_AXIS).displayName; if (xName == "") xName = xField; if (xName != "") dt += "&lt;i&gt;" + xName + ": &lt;/i&gt;"; var item:AreaSeriesItem = AreaSeriesItem(hd.chartItem); var lowItem:AreaSeriesItem = (minField != "") ? item : null; dt += dataTransform.getAxis(CartesianTransform.HORIZONTAL_AXIS).formatForScreen(item.xValue) + "\n"; var yName:String = dataTransform.getAxis(CartesianTransform.VERTICAL_AXIS).displayName; if (!lowItem) { if (yName != "") dt += "&lt;i&gt;" + yName + ":&lt;/i&gt; "; dt += dataTransform.getAxis(CartesianTransform.VERTICAL_AXIS).formatForScreen(item.yValue) + "\n"; } else { if (yName != "") dt += "&lt;i&gt;" + yName + " (high):&lt;/i&gt; "; else dt += "&lt;i&gt;high: &lt;/i&gt;"; dt += dataTransform.getAxis(CartesianTransform.VERTICAL_AXIS).formatForScreen(item.yValue) + "\n"; if (yName != "") dt += "&lt;i&gt;" + yName + " (low):&lt;/i&gt; "; else dt += "&lt;i&gt;low:&lt;/i&gt; "; dt += dataTransform.getAxis(CartesianTransform.VERTICAL_AXIS).formatForScreen(lowItem.minValue) + "\n"; } return dt; }; } </code></pre> <p>I just changed <code>formatForScreen(lowItem.yValue)</code> to <code>formatForScreen(lowItem.minValue)</code> in one place. You can use it like this:</p> <pre><code>&lt;mx:AreaChart dataProvider="{chartData}" showDataTips="true" dataTipFunction="{createAreaSeriesTipFunc(areaSeries)}"&gt; &lt;mx:series&gt; &lt;mx:AreaSeries id="areaSeries" yField="TotalVariableCost" minField="TotalFixedCost" displayName="Total Cost" /&gt; &lt;/mx:series&gt; &lt;/mx:AreaChart&gt; </code></pre>
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    1. UStakteek
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    1. COThanks a lot man! Posted this to flex-dev in the hope that somebody would commit your fix.
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      1. USMark Boulder
 

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