<?xml version="1.0" encoding="utf-8"?>

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"

                layout="vertical"

                verticalAlign="middle"

                backgroundColor="white" >

    <mx:Script>

        <![CDATA[

            import mx.controls.Button;

            import mx.controls.ButtonLabelPlacement;

            [Bindable]

            [Embed("assets/arrow_down.png")]

            private var arrowDown:Class;

            [Bindable]

            [Embed("assets/arrow_left.png")]

            private var arrowLeft:Class;

            [Bindable]

            [Embed("assets/arrow_right.png")]

            private var arrowRight:Class;

            [Bindable]

            [Embed("assets/arrow_up.png")]

            private var arrowUp:Class;

            private function init():void {

                var idx:uint;

                var len:uint = buttonBar.numChildren;

                var btn:Button;

                /* Loop over each button. */

                for (idx = 0; idx < len; idx++) {

                    /* Get reference to current Button. */

                    btn = buttonBar.getChildAt(idx) as Button;

                    /* Set labelPlacement property to current item in arr Array object. */

                    btn.labelPlacement = arr[idx].label;

                }

            }

        ]]>

    </mx:Script>

    <mx:Array id="arr">

        <mx:Object label="left" img="{arrowLeft}" />

        <mx:Object label="right" img="{arrowRight}" />

        <mx:Object label="top" img="{arrowUp}" />

        <mx:Object label="bottom" img="{arrowDown}" />

    </mx:Array>

    <mx:ButtonBar id="buttonBar"  dataProvider="{arr}" iconField="img" buttonHeight="64" width="500" creationComplete="init();" />

</mx:Application>