[flexcoders] Flex 3 piechart legend label

[flexcoder2008]

I have a pie chart that is bound to XML data and corresponding legend.  I am 
using data Tips to format the display value for "Project Number".  The data 
that is returned is numeric, but I want to add a 2 character string prefix 
before that number.

For example, when I hover over a pie slice I want to see "PR140", instead of 
the underlying plain data 140.

I am able to achieve this with the label functions but cannot figure out how to 
format the actual legend data.  How do I format the legend label - there does 
not seem to be a labelfunction for that?

Here is my code:

<mx:PieChart id="pieChart1" x="20" y="0" 
                showDataTips="true"
                dataTipFunction="pieChart_dataTipFunction" 
                selectionMode="single"
                height="200" width="300">
        <mx:series>
                <mx:PieSeries id="pieSeries" 
                        nameField="ProjectNumber"
                        labelPosition="callout"
                        field="ApprovedBudget"
                        labelFunction="pieSeriesLabelFunction"
                    explodeRadius="0.05"/>
        </mx:series>
</mx:PieChart>
                
<mx:Legend id="pieLegend"  
        labelPlacement="right" 
        x="335" y="110" />