[flexcoders] Dynamic LineSeries based upon Array Collection?

[tedgies]

Has anyone had any success in creating a chart with a series that 
you can add to at runtime?  (Like Yahoo finance charts 2.0).  I 
haven't yet seen an example where the LinSeries is based upon a 
changing (growing) set of external xml data files.  Below i paste a 
snippet where i try to for loop through an Array Collection and 
create a separate httpservice call for each dataset (each baseball 
player).  The httpservice URL is created dynamically based upon the 
arraycollection.  I don't get any errors, but my chart will not 
paint my data.  I think my problem is in:

newSeries.dataProvider = myService.lastResult.item;

thanks,
Ted

  <mx:Script><![CDATA[
        import mx.rpc.http.mxml.HTTPService;
        import mx.charts.chartClasses.StackedSeries;
        import mx.charts.chartClasses.Series;
        import mx.events.IndexChangedEvent;
        import mx.events.ListEvent;
        import mx.utils.StringUtil;
    import mx.controls.Alert;
    import mx.charts.events.ChartItemEvent;
    import mx.collections.ArrayCollection;
    import mx.utils.ArrayUtil;
    import mx.charts.series.LineSeries;
    import mx.charts.DateTimeAxis;
    import mx.charts.CategoryAxis;

[Bindable]
        public var ItemsInChart:ArrayCollection = new ArrayCollection
([            
                {playerName: "Babe_Ruth", playerID: "123456"},
                {playerName: "Hank_Aaron", playerID: "123457"}]);
          
    public function initApp():void {     
         //Loop through the ArrayCollection ItemsinChart and create 
a new httpservice and line for each.
                  var i:int;
                for (i = 0; i < ItemsInChart.length; i++) {
                            var myService:HTTPService = new 
HTTPService();
                            var playerStr:String = 
ItemsInChart.getItemAt(i).playerName;          
                            myService.url = "assets/" + playerStr 
+ ".xml";
                            myService.send();
               
         // Create the new series and set its properties.
                 var series:Array = myChart.series;
                 var newSeries:LineSeries = new LineSeries;
                 newSeries.dataProvider = myService.lastResult.item;
                 newSeries.xField = "Year";
                 newSeries.yField = "Home_Runs";
                 newSeries.displayName = "Home Runs for Baseball 
Greats";
                 newSeries.name = "Home Runs";   
               // Add the new series to the current Array of series.
             series.push(newSeries);
                 myChart.series = series;
            }
    }        
  ]]>
       </mx:Script>