flex的功能很强大，我们可以利用渐变色来制作圆角按钮，下面有个不错的示例，感兴趣的朋友可以了解下
复制代码 代码如下:
<?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 />
<s:State />
<s:State />
<s:State />
</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
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>