[flexcoders] Adding a node to xml document updates tree's dataprovider

[Steve Ashton]

I've got a tree which, as it's dataprovider, uses a child of an xml
document.  When I add a new node as a child of the tree's dataprovider,
the dataprovider is reassigned and becomes an XMLList containing all the
siblings of the original dataprovider.  It works as expected in Flex
2.0.1 Hotfix 3.  I see the error using Flex Builder 3.

Does anyone know if I am accessing/updating the xml in an incorrect way?
Or is this a bug that needs to be logged?



<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"; >
     <mx:Button label="Load DP" click="addDP()" />
     <mx:Button label="Add Node" click="addNode()" />
     <mx:Tree id="tree" dataProvider="{foo}" labelField="@label"
width="300" height="300" />

     <mx:Script><![CDATA[
         import mx.collections.XMLListCollection;
         private var rootXML:XML=
             <Node label='Root'>
               <Node label='Foo' />
               <Node label='Bar' />
               <Node label='Baz' />
             </Node>;

         // Use this function to execute the databinding on the tree
         private function addDP():void {
             dispatchEvent(new Event('dpLoaded'));
         }

         [Bindable("dpLoaded")]
         private function get foo():XMLListCollection {
             return new XMLListCollection( new XMLList( rootXML.child(0)
) );
         }


         private function addNode():void {
             var dp:XMLListCollection =
XMLListCollection(tree.dataProvider);
             var root:XML = dp.getItemAt( 0 ) as XML;
             var coll:XMLListCollection = new XMLListCollection(
root.children() );
             coll.addItem( <Node label='New Node' /> );
         }
     ]]></mx:Script>

</mx:Application>