Use XMListCollection removeItemAt() method to remove the item

           
<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
    height="400">
    <mx:Script>
        
        import mx.collections.XMLListCollection;
        import mx.collections.ArrayCollection;
        [Bindable]
        public var myData:XML=
        <catalog>
            <category name="Meat">
                <product name="A" cost="4" isOrganic="No" isLowFat="Yes"/>
                <product name="B" cost="6" isOrganic="No" isLowFat="No"/>
                <product name="C" cost="1.5" isOrganic="Yes" isLowFat="No"/>
            </category>
        </catalog>;
        
        [Bindable]
        public var listDP:XMLListCollection = new XMLListCollection(new XMLList());
        
        private function doTreeSelect():void
        {
            if (prodTree.selectedItem)
                listDP.addItem(prodTree.selectedItem.copy());
        }
        private function doListRemove():void
        {
            if (prodList.selectedItem)
                listDP.removeItemAt(prodList.selectedIndex);
        }
      
    </mx:Script>
    <mx:Tree id="prodTree" dataProvider="{myData}" width="200" showRoot="false" labelField="@name" />
    <mx:HBox>
        <mx:Button id="treeSelect" label="Add to List" click="doTreeSelect()" />
        <mx:Button id="listRemove" label="Remove from List" click="doListRemove()" />
    </mx:HBox>
    <mx:List id="prodList" dataProvider="{listDP}" width="200" labelField="@name" />
</mx:Application>

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Use XMListCollection removeItemAt() method to remove the item : XML data « Data Model « Flex

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