Can ya point out where in the Framework that xField and yField get
used by the BarSeries? Not seeing it in BarSeries, Series or
ChartItem....

Here's what I've got so far:

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
layout="absolute" xmlns:custom="*">
      <mx:Script>
            <![CDATA[
                  [Bindable]
                  private var Jobs:Array = [{Task:"Number 1",Time:35,Depends:-1},
                                                            {Task:"Number 2",Time:30,Depends:0},
                                                            {Task:"Number 3",Time:35,Depends:1}];
            ]]>
      </mx:Script>
     
      <mx:BarChart id="bar" height="100%" width="100%" dataProvider="{Jobs}">
            <mx:verticalAxis>
                  <mx:CategoryAxis dataProvider="{Jobs}" categoryField="Task"/>
            </mx:verticalAxis>
            <mx:series>
                  <mx:Array>
                        <custom:GanttSeries yField="Task" displayName="Task"
durationValue="Time" dependentItem="Depends"/>
                  </mx:Array>
            </mx:series>
      </mx:BarChart>
</mx:Application>

Custom series:
package
{
      import mx.charts.series.BarSeries;
      public class GanttSeries extends BarSeries
      {
            private var _durationValue:String = null;
            private var _dependentItem:String = null;
           
            public function get durationValue():String {
                  return _durationValue;
            }
           
            public function set durationValue(value:String):void {
                  _durationValue = value;
            }
            public function get dependentItem():String {
                  return _dependentItem;
            }
           
            public function set dependentItem(value:String):void {
                  _dependentItem = value;
            }
           
            override protected function updateDisplayList(unscaledWidth:Number,
unscaledHeight:Number):void {
                 
                 
            }
      }
}


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