I can see the border and the background color is in light grey~ Any way to customize a button for different status such as mouse over, mouse click, release ? Thanks so much~~

haloBlue = #009DFF
haloGreen = #80FF4D
haloOrange = #FFB600
haloSilver = #AECAD9

You can convert other named colors to hex values using the following:

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">

    <mx:Script>
        <![CDATA[
            import mx.controls.Label;

            private function getHex(evt:Event):void {
                var lbl:Label = evt.currentTarget as Label;
                lbl.text += "#" + ("000000" + lbl.getStyle("color").toString(16)).substr(-6).toUpperCase();
            }
        ]]>
    </mx:Script>

    <mx:Label id="haloBlueLabel"
            text="haloBlue = "
            color="haloBlue"
            initialize="getHex(event);" />

    <mx:Label id="haloGreenLabel"
            text="haloGreen = "
            color="haloGreen"
            initialize="getHex(event);" />

    <mx:Label id="haloOrangeLabel"
            text="haloOrange = "
            color="haloOrange"
            initialize="getHex(event);" />

    <mx:Label id="haloSilverLabel"
            text="haloSilver = "
            color="haloSilver"
            initialize="getHex(event);" />

</mx:Application>

Peter