<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2007/10/12/styling-the-colorpicker-control-in-flex-3/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="top"
        horizontalAlign="left"
        backgroundColor="white" viewSourceURL="srcview/index.html">

    <mx:Style>
        ColorPicker {
            swatchPanelStyleName: mySwatchPanel;
        }

        .mySwatchPanel {
            backgroundColor: haloSilver; 
            columnCount: 40; 
            horizontalGap: 1;
            verticalGap: 1;
            previewHeight: 50;
            previewWidth: 200;
            swatchHeight: 8;
            swatchWidth: 12;
        }
    </mx:Style>

    <mx:ApplicationControlBar dock="true">
        <mx:ColorPicker />
    </mx:ApplicationControlBar>

</mx:Application>