[flexcoders] dynamic lineseries?

[Paul Hastings]

i need to plot a dynamic set of lines for comparison purposes. the data is 
being 
returned from cf as an array of VO something along the lines of:

sampleID (string)
transmittance (array)
waveNumber (array)

this bit works fine. i'm having problems getting the graph to plot using the 
following function (smallFTIRComparisonChart is the mx:LineChart i'm drawing to 
add the dynamic line series to):

private function ftirComparisonDataHandler(event:ResultEvent):void {
  import mx.charts.series.LineSeries;
  var thisSeries:LineSeries;
  var series:Array=new Array();
  ftirComparisonData=event.result as Array;
  for (var i:int=0; i < ftirComparisonData.length; i++) {
        thisSeries=new LineSeries();
        thisSeries.dataProvider=ftirComparisonData[i];
        thisSeries.displayName=ftirComparisonData[i].sampleID;
        thisSeries.yField="transmittance";
        thisSeries.xField="waveNumber"
        series.push(thisSeries);
  }
  smallFTIRComparisonChart.series=series;
}

this all seems to work ok, no compile errors, debug shows all the going to the 
right bits, the axis changes but no graph lines are produced. what am i 
missing? 
is there a better way to handle this?

thanks.