<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2007/12/29/changing-the-swatch-border-size-for-a-colorpicker-control-in-flex-3/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
		layout="vertical"
		verticalAlign="top"
		backgroundColor="white" viewSourceURL="srcview/index.html">

    <mx:Style>
        ColorPicker {
            swatchPanelStyleName: myCustomSwatchPanelStyleName;
        }

        .myCustomSwatchPanelStyleName {
            swatchBorderSize: 1;
        }
    </mx:Style>

    <mx:Script>
    	<![CDATA[
    		import mx.events.SliderEvent;

    		private function slider_change(evt:SliderEvent):void {
                var cssObj:CSSStyleDeclaration = StyleManager.getStyleDeclaration(".myCustomSwatchPanelStyleName");
                cssObj.setStyle("swatchBorderSize", evt.value);

                colorPicker.open();
    		}
    	]]>
    </mx:Script>

    <mx:ApplicationControlBar dock="true">
    	<mx:Form styleName="plain">
    		<mx:FormItem label="swatchBorderSize:">
    			<mx:HSlider id="slider"
    					minimum="0"
    					maximum="5"
    					value="1"
    					liveDragging="true"
    					snapInterval="1"
    					tickInterval="1"
    					change="slider_change(event);" />
    		</mx:FormItem>
    	</mx:Form>
    </mx:ApplicationControlBar>

    <mx:ColorPicker id="colorPicker" />

</mx:Application>