flex 图标设置百分比或者其它符号

<?xml version="1.0"?>
<!-- charts/PredefinedAxisStyles.mxml -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">

<mx:Script>
<!--[CDATA[
//导入相关包
import mx.collections.ArrayCollection;
import mx.charts.*;
import mx.charts.series.items.ColumnSeriesItem;
import mx.charts.ChartItem;
import mx.charts.chartClasses.Series;
import mx.charts.chartClasses.IAxis;
import mx.utils.ObjectUtil;

[Bindable]
public var expenses:ArrayCollection = new ArrayCollection([
{Month:"Jan", Profit:20, Expenses:15},
{Month:"Feb", Profit:10, Expenses:20},
{Month:"Jun", Profit:30, Expenses:40},
{Month:"Aug", Profit:15, Expenses:25},
{Month:"Set", Profit:40, Expenses:45}
]);



public function myLabelFormat(obj:Object,pcat:Object,ax:LinearAxis):String
{
return numForm.format(obj)+"%";
}

private function setCustomLabel(element:ChartItem, series:Series):String {
// Get a refereence to the current data element.
var data:ColumnSeriesItem = ColumnSeriesItem(element);

// Get a reference to the current series.
var currentSeries:ColumnSeries = ColumnSeries(series);

// Create a return String and format the number.
return numForm.format(data.yNumber) + "%";
}

public function myLabelDisplay(hd:HitData):String{
//return hd.displayText + "%";
// var curObj:Object = hd.item;
// var curSeries:BarSeries = BarSeries(hd.chartItem.element); // 获得当前的BarSeries
// return curObj.qual + "-" + curSeries.displayName + "\n"
// + uqStatistics.getUQAs(curSeries.xField, curObj.qualObj).length
// + RM.getString(BUNDLE_DASHBOARD, "label.piece");
var curObj:Object = hd.item;
var curSeries:ColumnSeries = ColumnSeries(hd.chartItem.element);
if(curSeries.yField == "Profit")
return curSeries.yField + ":" + hd.item