Duplicates when binding ArrayCollection to List

Question

Hi,
I'm working on a flex application.
There is a DataManger object that loads some XML data and store it in an ArrayCollection by doing something like that (code is simplified) :
private var _xmlLocations:XMLListCollection;
private var _countryList:ArrayCollection;
_xmlLocations = new XMLListCollection(data..location);
_countryList.addAll(_xmlLocations.list)
Then the DataManager send back the ArrayCollection to a component with a list using the Source setter.
<mx:ArrayCollection id="arrayData" />
<mx:List id="listMenu" dataProvider="{arrayData}">...</mx:List>
public function set Source(data:ArrayCollection):void{
     arrayData.source = data.source;
When I look at my ArrayCollection in the debugger, it first look like this :
But after the binding to the List, the ArrayCollection arrayData has every entry duplicated...
I'm probably doing something wrong... but what?
Thanks for any lighting or advices

Answer 1

I cannot confirm your issue, I've created simple test MXML application  to validate it
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
                layout="absolute"
               creationComplete="onCreationComplete()">   
    <mx:Script>
        <![CDATA[
            import mx.collections.ArrayCollection;
            protected var initArr : Array = new Array(1, 2, 3);           
            protected var initCollection : ArrayCollection = new ArrayCollection(initArr);
            [Bindable]
            protected var dataCollection : ArrayCollection = new ArrayCollection();
            public function set source(data:ArrayCollection):void {
                dataCollection.source = data.source;
            private function onCreationComplete() : void {
                source = initCollection;  
        ]]>
    </mx:Script>
    <mx:List dataProvider="{dataCollection}"/>
</mx:Application>