flex渐变色制作圆角橙色按钮

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

<s:SparkButtonSkin xmlns:fx="http://ns.adobe.com/mxml/2009"
             xmlns:s="library://ns.adobe.com/flex/spark"
             xmlns:fb="http://ns.adobe.com/flashbuilder/2009"
             minWidth="42" minHeight="30"
             alpha.disabled="0.5">

    <fx:Metadata>
        <![CDATA[
        /**
         * @copy spark.skins.spark.ApplicationSkin#hostComponent
         */
        [HostComponent("spark.components.Button")]
        ]]>
    </fx:Metadata>

    <!-- states -->
    <s:states>
        <s:State name="up" />
        <s:State name="over" />
        <s:State name="down" />
        <s:State name="disabled" />
    </s:states>

    <s:Rect left="0" right="0" top="0" bottom="0" topLeftRadiusX="7" topRightRadiusX="7"
			bottomLeftRadiusX="7" bottomRightRadiusX="7">
        <s:stroke>
			<s:SolidColorStroke color.up="0xfaa51a"/>
		</s:stroke>
		<s:fill>
			<s:LinearGradient rotation="0">
				<s:entries>
					<s:GradientEntry color="0xfaa51a"/>
					<s:GradientEntry color="0xf47a20" ratio=".5"/>
				</s:entries>
			</s:LinearGradient>
			<!--<s:RadialGradient rotation="0">
				<s:entries>
					<s:GradientEntry color="0xF0FFFF" ratio=".7"/>
					<s:GradientEntry color="0xFF83FA"/>
				</s:entries>
			</s:RadialGradient>-->
		</s:fill>
	</s:Rect>
    <!-- layer 8: text -->
    <!--- @copy spark.components.supportClasses.ButtonBase#labelDisplay  -->
    <s:Label id="labelDisplay"
             textAlign="center"
             maxDisplayedLines="1"
			 fontSize="20"
             horizontalCenter="0" verticalCenter="1" verticalAlign="middle"
             left="10" right="10" top="2" bottom="2"
			 color.up="0xffffff">
    </s:Label>

</s:SparkButtonSkin>