<mx:TileList
    xmlns:fx="http://ns.adobe.com/mxml/2009"
    xmlns:mx="library://ns.adobe.com/flex/mx"
    xmlns:s="library://ns.adobe.com/flex/spark"
    width="150" height="150" layoutDirection="rtl"
    selectedIndex="0"  dataProvider="{createAC()}"
    dragEnabled="true" dropEnabled="true" >

    <fx:Style>
        @namespace mx "library://ns.adobe.com/flex/mx";

        mx|TileList {
            direction: rtl;
        }

    </fx:Style>
<fx:Script>
<![CDATA[
import mx.collections.ArrayCollection;

    public function createAC():ArrayCollection
    {
        var col:ArrayCollection =
            new ArrayCollection(['A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z']);
        return (col);
    }
]]>
</fx:Script>
</mx:TileList>