<s:DropDownList 
    xmlns:fx="http://ns.adobe.com/mxml/2009" 
    xmlns:mx="library://ns.adobe.com/flex/mx" 
    xmlns:s="library://ns.adobe.com/flex/spark"
    prompt="Select One"
    width="150"
    layoutDirection="rtl"
    direction="rtl">
    
    <s:dataProvider>
    	<mx:ArrayCollection>
    		<fx:String>ProductA</fx:String>
    		<fx:String>ProductB</fx:String>
    		<fx:String>ProductC</fx:String>
    		<fx:String>ProductD</fx:String>
    		<fx:String>ProductE</fx:String>
    		<fx:String>ProductF</fx:String>
		</mx:ArrayCollection>
	</s:dataProvider>
	
</s:DropDownList>