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

<?xml version="1.0" encoding="utf-8"?>
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  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.
  The ASF licenses this file to You under the Apache License, Version 2.0
  (the "License"); you may not use this file except in compliance with
  the License.  You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

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  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

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<!--- The default wireframe skin class for the Spark ButtonBarMiddleButton component. 
        Skin classes in the wireframe package are useful for using as a simple base for a custom skin.

       @see spark.components.ButtonBar
       @see spark.components.ButtonBarButton
       
      @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.disabledStates="0.5">

    <!-- host component -->
    <fx:Metadata>
        /** 
         * @copy spark.skins.spark.ApplicationSkin#hostComponent
         */
        [HostComponent("spark.components.ButtonBarButton")]
    </fx:Metadata>
    
    <!-- states -->
    <s:states>
        <s:State name="up" />
        <s:State name="over" stateGroups="overStates" />
        <s:State name="down" stateGroups="downStates" />
        <s:State name="disabled" stateGroups="disabledStates" />
        <s:State name="upAndSelected" stateGroups="selectedStates, selectedUpStates" />
        <s:State name="overAndSelected" stateGroups="overStates, selectedStates" />
        <s:State name="downAndSelected" stateGroups="downStates, selectedStates" />
        <s:State name="disabledAndSelected" stateGroups="selectedUpStates, disabledStates, selectedStates" />
    </s:states>
    
    <!-- fill -->
    <s:Rect left="1" right="1" top="1" bottom="1">
        <s:fill>
            <s:SolidColor color="#FFFFFF" color.over="#EEEEEE" 
                        color.down="#DDDDDD" color.selectedStates="#DDDDDD" />
        </s:fill>
    </s:Rect>
    
    <!-- shadow (down state only) -->
    <s:Rect left="2" top="1" right="2" height="1" includeIn="downStates">
        <s:fill>
            <s:SolidColor color="#5C5C5C" alpha="0.25" />
        </s:fill>
    </s:Rect>
    <s:Rect left="1" top="2" right="1" height="1" includeIn="downStates">
        <s:fill>
            <s:SolidColor color="#5C5C5C" alpha="0.07" />
        </s:fill>
    </s:Rect>
    <s:Rect left="1" top="2" bottom="1" width="1" includeIn="downStates">
        <s:fill>
            <s:SolidColor color="#5C5C5C" alpha="0.07" />
        </s:fill>
    </s:Rect>
    <s:Rect right="1" top="2" bottom="1" width="1" includeIn="downStates">
        <s:fill>
            <s:SolidColor color="#5C5C5C" alpha="0.07" />
        </s:fill>
    </s:Rect>
    
    <!-- border - put on top of the fill so it doesn't disappear when scale is less than 1 -->
    <s:Rect left="0" right="0" top="0" bottom="0" width="69" height="20">
        <s:stroke>
            <s:SolidColorStroke color="#707070" />
        </s:stroke>
    </s:Rect>
    
    <!-- text -->
    <!--- @copy spark.components.supportClasses.ButtonBase#labelDisplay -->
    <s:Label id="labelDisplay"
             textAlign="center"
             verticalAlign="middle"
             maxDisplayedLines="1"
             horizontalCenter="0" verticalCenter="1"
             left="10" right="10" top="2" bottom="2">
    </s:Label>
    
</s:SparkButtonSkin>