frameworks/projects/sparkskins/src/mx/skins/spark/RadioButtonSkin.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,
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  See the License for the specific language governing permissions and
  limitations under the License.

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<!--- The Spark skin class for the MX RadioButton component. 

      @see mx.controls.RadioButton
      
      @langversion 3.0
      @playerversion Flash 10
      @playerversion AIR 1.5
      @productversion Flex 4
-->
<local:SparkSkinForHalo xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark"
      xmlns:local="mx.skins.spark.*"
      disabledAlpha="0.5">
      <!-- have to use disabledAlpha style rather than alpha.disabled as in most of our skins 
           because the enabled property gets pushed down in here from the Halo button, and since 
           the skin is a Group, it handles setting of alpha when disabled via the disabledAlpha style -->
    
    <fx:Script>
        /* Define the skin elements that should not be colorized. 
           For button, the graphics are colorized but the dot is not. */
        static private const exclusions:Array = ["dot"];
        /**
         * @private
         */
        override public function get colorizeExclusions():Array {return exclusions;}
        
        /* Define the symbol fill items that should be colored by the "symbolColor" style. */
        static private const symbols:Array = ["dotFill"];
        /**
         * @private
         */
        override public function get symbolItems():Array {return symbols};
        
        /* Define the border items.*/
        static private const borderItem:Array = ["borderEntry1", "borderEntry2"];
        /**
         * @private
         */
        override protected function get borderItems():Array {return borderItem;}
        
        /**
         * @private
         */
        override protected function initializationComplete():void
        {
            useChromeColor = true;
            super.initializationComplete();
        }
    </fx:Script>
    
    <local: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="selectedUp" stateGroups="selectedStates" />
        <s:State name="selectedOver" stateGroups="overStates, selectedStates" />
        <s:State name="selectedDown" stateGroups="downStates, selectedStates" />
        <s:State name="selectedDisabled" stateGroups="disabledStates, selectedStates" />
    </local:states>
    
    <s:Group width="13" height="13">
        <!-- drop shadow -->
        <s:Ellipse left="-1" top="-1" right="-1" bottom="-1">
            <s:stroke>
                <s:LinearGradientStroke rotation="90" weight="1">
                    <s:GradientEntry color="0x000000" 
                                   color.downStates="0xFFFFFF"
                                   alpha="0.011"
                                   alpha.downStates="0" />
                    <s:GradientEntry color="0x000000" 
                                   color.downStates="0xFFFFFF" 
                                   alpha="0.121"
                                   alpha.downStates="0.57" />
                </s:LinearGradientStroke>
            </s:stroke>
        </s:Ellipse>
        
        <!-- fill -->
        <s:Ellipse left="1" top="1" right="1" bottom="1">
            <s:fill>
                <s:LinearGradient rotation="90">
                    <s:GradientEntry color="0xFFFFFF" 
                                   color.overStates="0xBBBDBD" 
                                   color.downStates="0xAAAAAA" 
                                   alpha="0.85" />
                    <s:GradientEntry color="0xD8D8D8" 
                                   color.overStates="0x9FA0A1" 
                                   color.downStates="0x929496" 
                                   alpha="0.85" />
                </s:LinearGradient>
            </s:fill>
        </s:Ellipse>
        
        <!-- fill highlight -->
        <s:Path data="M 1 6 Q 2 2 6 1 Q 11 2 12 6 h -9">
            <s:fill>
                <s:SolidColor color="0xFFFFFF" alpha="0.33" />
            </s:fill>
        </s:Path>
        
        <!-- layer 6: highlight stroke (all states except down) -->
        <s:Ellipse left="1" right="1" top="1" bottom="1">
            <s:stroke>
                <s:LinearGradientStroke rotation="90" weight="1">
                    <s:GradientEntry color="0xFFFFFF" color.downStates="0x939393" alpha.overStates="0.22" />
                    <s:GradientEntry color="0xD8D8D8" color.downStates="0xB1B1B1" alpha.overStates="0.22" />
                </s:LinearGradientStroke>
            </s:stroke>
        </s:Ellipse>
        <s:Rect left="5" top="1" right="5" height="1">
            <s:fill>
                <s:SolidColor color="0xFFFFFF" 
                            color.downStates="0x939393"
                            alpha.overStates="0.22" />
            </s:fill>
        </s:Rect>
        
        <!-- border - put on top of the fill so it doesn't disappear when scale is less than 1 -->
        <s:Ellipse left="0" top="0" right="0" bottom="0">
            <s:stroke>
                <s:LinearGradientStroke rotation="90" weight="1">
                    <!--- @private -->
                    <s:GradientEntry id="borderEntry1" alpha="0.70" />
                    <!--- @private -->
                    <s:GradientEntry id="borderEntry2" alpha="0.80" />
                </s:LinearGradientStroke>
            </s:stroke>
        </s:Ellipse>
        
        <!-- dot -->
        <!--- @private -->
       <s:Path left="4" top="4" includeIn="selectedStates" id="dot" itemCreationPolicy="immediate"
             data="M 2.5 0 Q 4.5 0.5 5 2.5 Q 4.5 4.5 2.5 5 Q 0.5 4.5 0 2.5 Q 0.5 0.5 2.5 0">
           <s:fill>
                <!--- @private -->
               <s:SolidColor id="dotFill" color="0" alpha="0.9" />
           </s:fill>
       </s:Path>
       <s:Path left="4" top="7" includeIn="selectedStates" 
             data="M 0 0 Q 0.5 2 2.5 2.0 Q 3.5 2.0 4 0">
           <s:stroke>
               <s:LinearGradientStroke>
                   <s:GradientEntry color="0xFFFFFF" alpha="0.3" />
                   <s:GradientEntry color="0xFFFFFF" alpha="0.7" />
                   <s:GradientEntry color="0xFFFFFF" alpha="0.3" />
               </s:LinearGradientStroke>
           </s:stroke>
       </s:Path>
    </s:Group>
</local:SparkSkinForHalo>