[flexcoders] XML, HTTPSerivce, & Setting dataProvider in Action Script

[Brad Bueche]

I have been trying all morning to figure out how to set the dataprovider
for a line chart in actionscript.
 
Below is the code.  The dataprovider in MXML works  (and its the exact
same dataprovider!).  And if I put the statement back into the MXML for
the mx:LineChart it will work. Why wont this work in the actionscript?
 
******************************
Dataprovider in ActionScript
******************************
<mx:Script> 
<![CDATA[ 
[...{
switch(lineOfBusiness) 
                 { 
                         case "ABC": 
 
chartXML.url="http://hostname/Data/xmlData_ALL_ABC_12Months_All_Days_200
7.php";         
                        chartXML.send(); 
                        [....] 
                        line_Chart.dataProvider =
chartXML.lastResult.month[month_number].day; 
[....}
</mx:Script> 


<mx:HTTPService id="chartXML" resultFormat="e4x" showBusyCursor="true"
/> 
<mx:LineChart id="line_Chart" 
                 width="932" height="309" x="23" y="10"
showDataTips="true" > 
<mx:horizontalAxis> 
   <mx:CategoryAxis id="cat1"
dataProvider="{chartXML.lastResult.month[month_number].day}" 
           categoryField="{categoryFieldString}"
title="{categoryAxisTitleString}" /> 
   </mx:horizontalAxis> 
</mx:LineChart>