CheckBoxSkin.mxml

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

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<!--- The default skin class for the Spark CheckBox component.  

      @see spark.components.CheckBox
        
      @langversion 3.0
      @playerversion Flash 10
      @playerversion AIR 1.5
      @productversion Flex 4
-->
<s:SparkSkin xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark"
             xmlns:fb="http://ns.adobe.com/flashbuilder/2009" alpha.disabledStates="0.5" useHandCursor="true">

    <fx:Metadata>
    <![CDATA[ 
        /** 
         * @copy spark.skins.spark.ApplicationSkin#hostComponent
         */
        [HostComponent("spark.components.CheckBox")]
    ]]>
    </fx:Metadata> 
    
    <fx:Script fb:purpose="styling">
        /* Define the skin elements that should not be colorized. 
           For button, the graphics are colorized but the label is not. */
        static private const exclusions:Array = ["labelDisplay"];

       /** 
        * @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 = [];

       /**
        * @private 
        */
        override public function get symbolItems():Array {return symbols};
        
        /**
         * @private
         */
        override protected function initializationComplete():void
        {
            useChromeColor = true;
            super.initializationComplete();
        }
    </fx:Script>
    
    <fx:Script>
        <![CDATA[
			import flatspark.utils.AwesomeUtils;
			import flatspark.utils.ColorUtils;
			
            /** 
             * @private 
             */     
            private static const focusExclusions:Array = ["labelDisplay"];

            /**
             * @private
             */
            override public function get focusSkinExclusions():Array { return focusExclusions;};
        ]]>
    </fx:Script>
    
    <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" />
        <s:State name="overAndSelected" stateGroups="overStates, selectedStates" />
        <s:State name="downAndSelected" stateGroups="downStates, selectedStates" />
        <s:State name="disabledAndSelected" stateGroups="disabledStates, selectedStates" />
    </s:states>
    
    <s:Group verticalCenter="0" width="22" height="22" layoutDirection="ltr">
        <!-- fill -->
        <s:Rect left="1" top="1" right="1" bottom="1" radiusX="6">
            <s:fill>
                <s:SolidColor color="{ColorUtils.Silver}"/>
            </s:fill>
        </s:Rect>
		
		<s:Rect left="1" top="1" right="1" bottom="1" radiusX="6" includeIn="overStates">
			<s:fill>
				<s:SolidColor color="{ColorUtils.Asbestos}"/>
			</s:fill>
		</s:Rect>
		
		<s:Rect left="1" top="1" right="1" bottom="1" radiusX="6" includeIn="selectedStates">
			<s:fill>
				<s:SolidColor color="{ColorUtils.Turquoise}"/>
			</s:fill>
		</s:Rect>
        
		<s:Label id="check" fontFamily="FontAwesome" fontSize="12" color="#FFFFFF" text="{AwesomeUtils.fa_check}" includeIn="selectedStates"
				 itemCreationPolicy="immediate" verticalAlign="middle" horizontalCenter="0" verticalCenter="0"
				 />
    </s:Group>

    <!-- Label -->
    <!--- @copy spark.components.supportClasses.ButtonBase#labelDisplay -->
    <s:Label id="labelDisplay"
             textAlign="start" color="{ColorUtils.WetAsphalt}"
             verticalAlign="middle" fontSize="14"
             maxDisplayedLines="1" fontFamily="Lato" paddingLeft="30"
             left="0" right="0" top="3" bottom="3" verticalCenter="2" />

</s:SparkSkin>

This Flatspark CheckBoxSkin simply adds id='check' to the Label that represents the checkmark