Change BorderContainer background color with AS – Flex 4

Below is the code snippet that give you the expected functionality.

var sourceBitmap:BitmapData = new BitmapData(myChart.width, myChart.height,true,0x000000);
sourceBitmap.draw(myChart);  
//prev image is the "Image" variable name
prevImage.source = new Bitmap(sourceBitmap);

Flex 3 used textRollOverColor and textSelectedColor but Flex 4 components does not support them anymore.

The following example demonstrates all this + adding support for this colors for spark List:

<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/mx">

    <fx:Style>
        @namespace s "library://ns.adobe.com/flex/spark";
        @namespace mx "library://ns.adobe.com/flex/mx";

        global
        {
            textRollOverColor: yellow;
            textSelectedColor: green;
        }

    </fx:Style>

    <fx:Script>
    <![CDATA[
        import mx.collections.ArrayCollection;

        private function getListDataProvider():ArrayCollection
        {
            return new ArrayCollection([ "Item 1", "Item 2", "Item 3"]);
        }

        private function getGridDataProvider():ArrayCollection
        {
            return new ArrayCollection([ { name: "Item 1" }, { name: "Item 2" }, { name: "Item 3" } ]);
        }

    ]]>
    </fx:Script>

    <s:layout>
        <s:VerticalLayout horizontalAlign="center" verticalAlign="middle"/>
    </s:layout>

    <s:List dataProvider="{getListDataProvider()}"/>

    <s:List dataProvider="{getListDataProvider()}" itemRenderer="ColoredItemRenderer"/>

    <mx:List dataProvider="{getListDataProvider()}"/>

    <mx:DataGrid dataProvider="{getGridDataProvider()}"/>

</s:Application>

ColoredItemRenderer:

<s:ItemRenderer xmlns:fx="http://ns.adobe.com/mxml/2009" 
    xmlns:s="library://ns.adobe.com/flex/spark" 
    xmlns:mx="library://ns.adobe.com/flex/mx" 
    autoDrawBackground="true">

    <fx:Script>
    <![CDATA[

        override protected function updateDisplayList(unscaledWidth:Number, unscaledHeight:Number):void
        {
            super.updateDisplayList(unscaledWidth, unscaledHeight);

            var color:uint;
            if (selected)
                color = getStyle("textSelectedColor");
            else if (hovered)
                color = getStyle("textRollOverColor");
            else
                color = getStyle("color");
            sparkLabel.setStyle("color", color);
        }

    ]]>
    </fx:Script>

    <s:Label id="sparkLabel" text="{data}"/>

</s:ItemRenderer>