Any update on paragraph backgroundColor?

Here is one way to find the first paragraph's boundary. Also there are many other ways. The point is how to get the TextFlowLine(TLF object, related to a TextLine in the container, include more information than TextLine)/TextLine(FTE object or engine object, the actual lines added to the container and show on the screen, has less info).

<?xml version="1.0" encoding="utf-8"?>
<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" minWidth="955" minHeight="600" applicationComplete="getInfo()">
    <fx:Script>
        <![CDATA[
            import flashx.textLayout.compose.IFlowComposer;
            import flashx.textLayout.compose.TextFlowLine;
            function getInfo():void{
                var firstPara:ParagraphElement = rt.textFlow.getChildAt(0) as ParagraphElement;
                var composer:IFlowComposer = rt.textFlow.flowComposer;
                var firstLineInFirstPara:TextFlowLine = composer.findLineAtPosition(0);
                var x:Number = firstLineInFirstPara.x;
                var y:Number = firstLineInFirstPara.y;
                var lastLineInFirstPara:TextFlowLine = composer.findLineAtPosition(firstPara.textLength-1);
                var width:Number = rt.width;// You can also get the width from the widest textline
                var height:Number = lastLineInFirstPara.y - y + lastLineInFirstPara.height;
               
                rt.graphics.lineStyle(1, 0);
                rt.graphics.drawRect(x,y,width,height);
            }
        ]]>
    </fx:Script>
    <s:RichEditableText id="rt" width="100">
        <s:content>
            <s:p>The following example shows how you can import a TextFlow object from an XML object in Flex 4 by using the static</s:p><s:p>The following example shows how you can import a TextFlow object from an XML object in Flex 4 by using the static</s:p>   
        </s:content>
    </s:RichEditableText>
</s:Application>