设置NumericStepper控件某一边框的宽度。

设置NumericStepper控件，上下左右，某一个边框的宽度.通过 borderStyle 和 borderSides 样式。
示例：

代码：

<? xml version="1.0" encoding="utf-8" ?>
<!--  http://blog.flexexamples.com/2008/05/27/setting-a-border-on-specific-sides-of-a-numericstepper-control-in-flex/  -->
< mx:Application  xmlns:mx ="http://www.adobe.com/2006/mxml"
        layout ="vertical"
        verticalAlign ="middle"
        backgroundColor ="white" >

     < mx:Script >
         <![CDATA[
            private function checkBox_change(evt:Event):void {
                var sidesStr:String;
                var sidesArr:Array = [];
                if (leftCheckBox.selected) {
                    sidesArr.push("left");
                }
                if (rightCheckBox.selected) {
                    sidesArr.push("right");
                }
                if (topCheckBox.selected) {
                    sidesArr.push("top");
                }
                if (bottomCheckBox.selected) {
                    sidesArr.push("bottom");
                }
                sidesStr = sidesArr.join(" ");
                numericStepper.setStyle("borderSides", sidesStr);
            }
         ]]>
     </ mx:Script >

     < mx:ApplicationControlBar  dock ="true" >
         < mx:Form  styleName ="plain" >
             < mx:FormItem  label ="border left:" >
                 < mx:CheckBox  id ="leftCheckBox"
                        selected ="true"
                        change ="checkBox_change(event);"   />
             </ mx:FormItem >
             < mx:FormItem  label ="border right:" >
                 < mx:CheckBox  id ="rightCheckBox"
                        selected ="true"
                        change ="checkBox_change(event);"   />
             </ mx:FormItem >
             < mx:FormItem  label ="border top:" >
                 < mx:CheckBox  id ="topCheckBox"
                        selected ="true"
                        change ="checkBox_change(event);"   />
             </ mx:FormItem >
             < mx:FormItem  label ="border bottom:" >
                 < mx:CheckBox  id ="bottomCheckBox"
                        selected ="true"
                        change ="checkBox_change(event);"   />
             </ mx:FormItem >
             < mx:FormItem  label ="borderThickness:" >
                 < mx:HSlider  id ="slider"
                        minimum ="0"
                        maximum ="10"
                        value ="4"
                        snapInterval ="1"
                        tickInterval ="1"
                        liveDragging ="true"   />
             </ mx:FormItem >
         </ mx:Form >
     </ mx:ApplicationControlBar >

     < mx:NumericStepper  id ="numericStepper"
            borderStyle ="solid"
            borderThickness =" {slider.value} "
            borderSides ="left right top bottom"   />

</ mx:Application >

来自： http://blog.flexexamples.com/2008/05/27/setting-a-border-on-specific-sides-of-a-numericstepper-control-in-flex/