我想强制用户仅使用箭头编辑NumericStepper的值，这样他们就不能直接在值字段中输入值

    <fx:Script>
        <![CDATA[
            protected function init():void {
                nmStppr.textDisplay.editable = false;
            }
        ]]>
    </fx:Script>

    <s:NumericStepper id="nmStppr"
            horizontalCenter="0" verticalCenter="0"
            creationComplete="init();"/>

<s:NumericStepper id="num"
            horizontalCenter="0" verticalCenter="0"
            creationComplete="init();"/>

<fx:Script>
        <![CDATA[
            protected function init():void {
               num.mx_internal::inputField.editable=false;
            }
        ]]>
    </fx:Script>