<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/07/17/changing-the-background-color-of-a-disabled-list-control-in-flex/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">

    <mx:Script>
        <![CDATA[
            import mx.events.ColorPickerEvent;

            private function colorPicker_change(evt:ColorPickerEvent):void {
                list.setStyle("backgroundDisabledColor", evt.color);
            }
        ]]>
    </mx:Script>

    <mx:Array id="arr">
        <mx:Object label="One" />
        <mx:Object label="Two" />
        <mx:Object label="Three" />
        <mx:Object label="Four" />
        <mx:Object label="Five" />
        <mx:Object label="Six" />
        <mx:Object label="Seven" />
        <mx:Object label="Eight" />
        <mx:Object label="Nine" />
        <mx:Object label="Ten" />
    </mx:Array>

    <mx:ApplicationControlBar dock="true">
        <mx:Form styleName="plain">
            <mx:FormItem label="enabled:">
                <mx:CheckBox id="checkBox"
                        selected="true" />
            </mx:FormItem>
            <mx:FormItem label="backgroundDisabledColor:">
                <mx:ColorPicker id="colorPicker"
                        selectedColor="0xDDDDDD"
                        change="colorPicker_change(event);" />
            </mx:FormItem>
        </mx:Form>
    </mx:ApplicationControlBar>

    <mx:List id="list"
            dataProvider="{arr}"
            enabled="{checkBox.selected}"
            width="200" />

</mx:Application>