dynamically creating charts

[LittleMuscle]

i am trying to dynamically create a chart but it isn't working. can someone
look at my code and tell me what i am doing wrong.

private function addGraph(event:Event):void {
var gr:ColumnChart = new ColumnChart();
gr.id="graph2";
gr.dataProvider="{feedRequest.lastResult.videos.vi deo}";
var series:Object = gr.series[0]; ////(i tried var series:Object =
graph2.series[0]; but this returns error:undef property graph2)
series.yField = "views";
hbox1.addChild(gr);
}


i tried modelling the code after the 3rd example at
[url]http://livedocs.adobe.com/flex/2/docs/wwhelp/wwhimpl/common/html/wwhelp.htm?cont[/url]
ext=LiveDocs_Parts&file=00001212.html
here is the httpservice:
<mx:HTTPService id="feedRequest" url="http://ws.jamesward.org/youtube.xml"
useProxy="false"/>

[LittleMuscle]

i also tried taking out the event:Event so the function reads...

private function addGraph():void {...