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Remove item from Tile

<?xml version="1.0"?> <mx:Application      xmlns:mx="http://www.adobe.com/2006/mxml">     <mx:Script>                      import mx.effects.DefaultListEffect;             import mx.collections.ArrayCollection;                          [Bindable]             private var dataCollection:ArrayCollection = new ArrayCollection();                          private function removeFromList():void {                 var index : int = dataCollection.getItemIndex( tileList.selectedItem );                 dataCollection.removeItemAt( index );             }             private function addToList():void {                 dataCollection.addItemAt( Math.random(), 0);             }                        </mx:Script>     <mx:DefaultTileListEffect id="effect" moveDuration="250" fadeInDuration="250" fadeOutDuration="250" />     <mx:TileList id="tileList" width="500" height="200" dataProvider="{ dataCollection }" itemsChangeEffect="{ effect }" />     <mx:HBox>         <mx:Button label="Add New Item" click="addToList();" />         <mx:Button label="Remove Selected Item" click="removeFromList();" />     </mx:HBox>      </mx:Application>