frameworks/projects/wireframe/src/spark/skins/wireframe/ButtonSkin.mxml

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

  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
  this work for additional information regarding copyright ownership.
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  (the "License"); you may not use this file except in compliance with
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      http://www.apache.org/licenses/LICENSE-2.0

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  distributed under the License is distributed on an "AS IS" BASIS,
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  See the License for the specific language governing permissions and
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<!--- The default wireframe skin class for the Spark Button component. 
        Skin classes in the wireframe package are useful for using as a simple base for a custom skin.
      
       @see spark.components.Button
        
      @langversion 3.0
      @playerversion Flash 10
      @playerversion AIR 1.5
      @productversion Flex 4
-->
<s:SparkButtonSkin xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" 
      minWidth="22" minHeight="22"
      alpha.disabled="0.5">

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

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

    <!-- background -->
    <s:Rect left="0" right="0" top="0" bottom="0"
          width="69" height="20"
          radiusX="2" radiusY="2">
        <s:stroke>
            <s:SolidColorStroke color="#A9A9A9" color.over="#9C9C9C" color.down="#9C9C9C" />
        </s:stroke>
        <s:fill>
            <s:SolidColor color="#BABABA" color.up="#EEEEEE" color.over="#DDDDDD" color.down="#DDDDDD" />
        </s:fill>
    </s:Rect>

    <!-- shadow (down state only) -->
    <s:Rect includeIn="down" left="0" right="0" y="0" height="4" radiusX="2">
        <s:fill>
            <s:LinearGradient rotation="90">
                <s:GradientEntry alpha="0.23" color="#000000" ratio="0"/>
                <s:GradientEntry alpha="0.20" color="#000000" ratio="0.4"/>
                <s:GradientEntry alpha="0.055" color="#000000" ratio="0.55"/>
                <s:GradientEntry alpha="0.0" color="#000000" ratio="0.8"/>
            </s:LinearGradient>
        </s:fill>
    </s:Rect>
    <s:Rect includeIn="down" x="0" width="4" top="0" bottom="0" radiusX="2">
        <s:fill>
            <s:LinearGradient rotation="0">
                <s:GradientEntry alpha="0.13" color="#000000" ratio="0"/>
                <s:GradientEntry alpha="0.12" color="#000000" ratio="0.2"/>
                <s:GradientEntry alpha="0.0" color="#000000" ratio="0.55"/>
            </s:LinearGradient>
        </s:fill>
    </s:Rect>
    
    <!-- label -->
    <!--- @copy spark.components.supportClasses.ButtonBase#labelDisplay -->
    <s:Label id="labelDisplay"
             horizontalCenter="0" verticalCenter="1" verticalCenter.down="2"
             left="10" right="10" top="2" bottom="2"
             textAlign="center"
             verticalAlign="middle"
             maxDisplayedLines="1">
    </s:Label>

</s:SparkButtonSkin>