Attractive Checkbox in Flex4

Main mxml file (say AHCkeckboxTest.mxml )

<?xml version="1.0" encoding="utf-8"?>
<s:Application
    xmlns:fx="http://ns.adobe.com/mxml/2009"
    xmlns:s="library://ns.adobe.com/flex/spark"
    xmlns:mx="library://ns.adobe.com/flex/halo"
    minWidth="1020"
    minHeight="720"
    frameRate="99"
    backgroundColor="0xe0f0ff" viewSourceURL="srcview/index.html">
   
    <fx:Style>
        @namespace mx "library://ns.adobe.com/flex/halo";
        @namespace s "library://ns.adobe.com/flex/spark";
       
        s|CheckBox {
            skinClass: ClassReference("AHCheckboxSkin");
            symbolColorChecked: "0x70d000";
            symbolColorUnchecked: "0xe83800";
            fontSize: "11";
            color: "0x606060";
        }
           
            .default {
                skinClass: ClassReference("spark.skins.spark.CheckBoxSkin");
            }
    </fx:Style>
    <s:HGroup gap="25" horizontalCenter="0" verticalCenter="0">
        <s:VGroup  gap="5">
            <s:Label text="Default Spark CheckBox" paddingBottom="4" fontSize="11" textDecoration="underline"  />
            <s:CheckBox label="Show Goalkeepers"    styleName="default" selected="true" />
            <s:CheckBox label="Show Defenders"         styleName="default" />
            <s:CheckBox label="Show Midfielders"     styleName="default" selected="true"/>
            <s:CheckBox label="Show Attackers"       styleName="default"    selected="true"/>
            <s:CheckBox label="Show Coaches"           styleName="default"    />
        </s:VGroup>
        <s:Line height="100%" >
            <s:stroke>
                <s:SolidColorStroke weight="1" color="0xd0e0f0" />
            </s:stroke>
        </s:Line>
        <s:VGroup  gap="5">
            <s:Label text="Custom Spark CheckBox" paddingBottom="4" fontSize="11" textDecoration="underline" />
            <s:CheckBox label="Show Goalkeepers"      selected="true" />
            <s:CheckBox label="Show Defenders"      selected="true"/>
            <s:CheckBox label="Show Midfielder"     />
            <s:CheckBox label="Show Attackers"       />
            <s:CheckBox label="Show Coaches"         selected="true"/>
        </s:VGroup>
    </s:HGroup>
</s:Application>







Skin class (say AHCheckboxSkin.mxml )

<?xml version="1.0" encoding="utf-8"?>
<s:SparkSkin xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark"
             alpha.disabledStates="0.5" creationComplete="sparkskin1_creationCompleteHandler(event)">
   
    <fx:Metadata>
        <![CDATA[
    /**
     * @copy spark.skins.default.ApplicationSkin#hostComponent
     */
        [HostComponent("spark.components.CheckBox")]
    ]]>
    </fx:Metadata>
    <fx:Script>
    <![CDATA[
        import mx.utils.ColorUtil;
        import mx.events.FlexEvent;
       
        [Bindable]   
        private var highlightColor:uint;
       
        protected function sparkskin1_creationCompleteHandler(event:FlexEvent):void
        {
            hostComponent.buttonMode = true;
            hostComponent.useHandCursor = true;
            var col:uint = uint (hostComponent.getStyle('color'));
            highlightColor = ColorUtil.adjustBrightness(col, 80);
        }
    ]]>
    </fx:Script>
   
   
    <fx:Declarations>
        <s:Linear id="easer" easeInFraction="0.5"  easeOutFraction="0.5" />
    </fx:Declarations>
   
    <s:states>
        <s:State name="up"  stateGroups="unchecked" />
        <s:State name="over" stateGroups="overStates, unchecked" />
        <s:State name="down" stateGroups="downStates, unchecked" />
        <s:State name="disabled" stateGroups="disabledStates, unchecked" />
        <s:State name="upAndSelected" stateGroups="selectedStates, checked" />
        <s:State name="overAndSelected" stateGroups="overStates, selectedStates, checked" />
        <s:State name="downAndSelected" stateGroups="downStates, selectedStates, checked" />
        <s:State name="disabledAndSelected" stateGroups="disabledStates, selectedStates, checked" />
    </s:states>
   
    <!-- Transitions for the mark -->
    <s:transitions>
        <s:Transition  fromState="unchecked"  toState="overAndSelected" >
            <s:Parallel target="{checkedMark}" >
                <s:Scale duration="250" scaleXBy="1"   easer="{easer}" />
            </s:Parallel>
        </s:Transition>
        <s:Transition fromState="checked" toState="over" >
            <s:Parallel target="{uncheckedMark}">
                <s:Scale duration="250" easer="{easer}" />
            </s:Parallel>
        </s:Transition>
    </s:transitions>
   
    <!-- Label -->
    <s:Label id="labelDisplay"
                  textAlign="start"
                  color.over="{highlightColor}"
                  color.down="{highlightColor}"
                  color.overAndSelected="{highlightColor}"
                  color.downAndSelected="{highlightColor}"
                  verticalAlign="middle"
                  lineBreak="explicit"
                  left="16" right="0" top="3" bottom="3" verticalCenter="2" />
    <!-- Group with the marks -->
    <s:Group id="marks" verticalCenter="0" width="11" height="11" left="0" >
       
        <!-- GraphicElement for the checked-mark -->
        <s:Path horizontalCenter="0" verticalCenter="0" width="11" height="11" winding="nonZero" data="M 100 0 C 75.148 24.853 46.191 87.574 46.191 87.574 C 46.191 87.574 14.204 40.716 0 40.716 L 25.11 41.012 L 43.787 62.213 L 79.29 0 L 100 0 Z"
                id="checkedMark" scaleX.unchecked="0" scaleX="1" scaleY.unchecked="0" scaleY="1">
            <s:fill>
                <s:SolidColor color="{hostComponent.getStyle('symbolColorChecked')}"/>
            </s:fill>
        </s:Path>
       
        <!-- GraphicElement for the unchecked-mark -->
        <s:Path horizontalCenter="0" verticalCenter="0" width="9" height="9" winding="nonZero" data="M 100 90.29 L 60.694 42.28 C 72.2 26.205 84.896 9.838 95.214 0 L 74.28 0.1 L 51.336 30.851 L 26.922 1.031 L 0 1.031 C 13.126 7.917 29.115 24.561 43.297 41.625 L 7.425 89.702 L 28.995 89.617 C 28.995 89.617 39.309 73.04 52.832 53.468 C 68.081 72.987 79.403 90.131 79.403 90.131 L 100 90.29 Z"
                id="uncheckedMark" scaleX.checked="0" scaleX="1" scaleY.checked="0" scaleY="1">
            <s:fill>
                <s:SolidColor id="checkMarkFill" color="{hostComponent.getStyle('symbolColorUnchecked')}"/>
            </s:fill>
        </s:Path>
       
        <!-- Fake HitArea. TODO: Sort out how to use hitArea property, which does not seem to work correctly yet, but haven't investigated -->
        <s:Group width="100%" height="100%" alpha="0" >
            <s:Rect width="100%" height="100%"  >
                <s:fill>
                    <s:SolidColor color="0xff0000" />
                </s:fill>
            </s:Rect>
        </s:Group>
       
        <s:filters>
            <s:DropShadowFilter distance="1" strength="0.75" blurX="1" blurY="1" />
        </s:filters>
    </s:Group>
</s:SparkSkin>



Folder Structure