Column Chart displaying blank columns

Question

I've this column chart whose data provider is set dynamically. The chart has a two Column Series. Occasionally the columns are displayed as blank.
Although the corresponding labels on x-axis and tool tips are displayed correctly. Has anyone experienced similar issue? Kindly suggest a solution.

Answer 1

Thanks for the reply. No the data provider is surely not null as the same collection
is being set as data provider for a data grid too. And data grid always displays the data.
Besides if the data provider was null it wouldn't have shown the x-axis labels and the
tool tip values.
Code Sample:
Basically chartData is a XMLListCollection object, its being populated on a call back method of a
HTTPService request.
The following method is called once the chartData is populated.
//Populate columns for abcChart
private function populateColumns():void {
     abcChart.series = new Array();
     var haltsSeries:ColumnSeries = new ColumnSeries();
     var haltsFill:SolidColor = new SolidColor(0xFF0000);
     haltsSeries.dataProvider = chartData;
     haltsSeries.displayName = "Halts";
     haltsSeries.yField = "HALTS";
     haltsSeries.setStyle("fill",haltsFill);
     abcChart.series.push(haltsSeries);
     var warningsSeries:ColumnSeries = new ColumnSeries();
     var warningsFill:SolidColor = new SolidColor(0xFFFF66);
     warningsSeries.dataProvider = chartData;
     warningsSeries.displayName = "Warnings";
     warningsSeries.yField = "WARNINGS";
     warningsSeries.setStyle("fill",warningsFill);
     abcChart.series.push(warningsSeries);
     return;
Following is the Columnchart with its children and properties.
<mx:ColumnChart id="abcChart" showDataTips="true"
width="100%" height="95%" visible="false"
dataTipFunction="chartDataTip">
<mx:backgroundElements>
<mx:GridLines direction="horizontal">
<mx:horizontalStroke>
<mx:Stroke color="0xCCCCCC" weight="1"/>
</mx:horizontalStroke>
</mx:GridLines>
</mx:backgroundElements>
<mx:horizontalAxis>
<mx:CategoryAxis displayName="Area"
categoryField="AREA"/>
</mx:horizontalAxis>
<mx:horizontalAxisRenderer>
<mx:AxisRenderer fontSize="8"
cachePolicy="off" rotation="40"/>
</mx:horizontalAxisRenderer>
<mx:verticalAxis>
<mx:LinearAxis title="Count"
minimum="0" autoAdjust="true"/>
</mx:verticalAxis>
</mx:ColumnChart>