Help using dynamic XML with Tree Menu

Question

Can some one please help me? I don't know what I'm doing
wrong. I'd simply like to be able to load an XML file of data and
use this data to populate a Flex tree component.
The XML file needs to reside on the server and will change
from time to time, so I am loading it via an HTTPService call. The
part that I can't get to work is the way the
XML is displayed in the Tree component. It ends up blank or
sometimes I just get the result of "[object Object]". I know my
syntax must be screwed up somewhere, but because
AS3 and Flex are new territory for me, I can't get it to
work. I am feeling my IQ drop on a minute to minute basis. Please
help me if you can! Thanks!
In this example, I am expecting a list of the different
groceries/categories to show up in the tree menu. Instead, I get
nothing.
HERE IS THE XML FILE, CALLED "groceries.xml":
<catalog>
<category name="Meat">
<product name="Buffalo" cost="4" isOrganic="No"
isLowFat="Yes"/>
<product name="T Bone Steak" cost="6" isOrganic="No"
isLowFat="No"/>
<product name="Whole Chicken" cost="1.5" isOrganic="Yes"
isLowFat="No"/>
</category>
<category name="Vegetables">
<product name="Broccoli" cost="2.16" isOrganic="Yes"
isLowFat="Yes"/>
<product name="Vine Ripened Tomatoes" cost="1.69"
isOrganic="No" isLowFat="Yes"/>
<product name="Yellow Peppers" cost="1.25"
isOrganic="Yes" isLowFat="Yes"/>
</category>
<category name="Fruit">
<product name="Bananas" cost="0.95" isOrganic="Yes"
isLowFat="Yes"/>
<product name="Grapes" cost="1.34" isOrganic="No"
isLowFat="Yes" />
<product name="Strawberries" cost="2.5" isOrganic="Yes"
isLowFat="Yes"/>
</category>
</catalog>
HERE IS THE MXML FLEX FILE THAT ISN'T WORKING AS I'D LIKE IT
TO:
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="
http://www.adobe.com/2006/mxml"
layout="absolute" initialize="initializeHandler(event)" width="240"
height="340">
<mx:Script>
<![CDATA[
import mx.collections.XMLListCollection;
import mx.collections.ICollectionView;
import mx.controls.List;
private function initializeHandler(event:Event):void {
textService.send();
private function resultHandler(event:Event):void {
myTree.dataProvider = textService.lastResult.catalog;
]]>
</mx:Script>
<mx:HTTPService id="textService" url="groceries.xml"
result="resultHandler(event)" />
<mx:Tree id="myTree" labelField="@name" showRoot="false"
x="20" y="20" width="200" height="300" />
</mx:Application>
Any help is deeply appreciated.

Answer 1

You must specify a resultformat of e4x. The default
resultFormat is object. Object only works when you have a very
simple xml structure that can be consistently represented as a set
of objects.