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Create two functions that access complex data for both the axis and the series

<!-- Code from Flex 4 Documentation "Using Adobe Flex 4". This user guide is licensed for use under the terms of the Creative Commons Attribution  Non-Commercial 3.0 License.  This License allows users to copy, distribute, and transmit the user guide for noncommercial  purposes only so long as    (1) proper attribution to Adobe is given as the owner of the user guide; and    (2) any reuse or distribution of the user guide contains a notice that use of the user guide is governed by these terms.  The best way to provide notice is to include the following link.  To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/ -->     <!-- charts/DataFunctionExample.mxml --> <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"     xmlns:mx="library://ns.adobe.com/flex/mx" xmlns:s="library://ns.adobe.com/flex/spark"     height="600">     <fx:Script>          import mx.charts.chartClasses.AxisBase;          import mx.charts.chartClasses.Series;          import mx.charts.CategoryAxis;          import mx.charts.chartClasses.IAxis;          import mx.charts.chartClasses.ChartBase;          import mx.charts.chartClasses.CartesianTransform;          // This data provider contains complex, nested objects.          [Bindable]          public var SMITH:Array = [              {month: "Aug", close: {High:45.87,Low:12.2}, open:25.19},              {month: "Sep", close: {High:45.74,Low:10.23}, open:35.29},              {month: "Oct", close: {High:45.77,Low:12.13}, open:45.19},              {month: "Nov", close: {High:46.06,Low:10.45}, open:15.59},          ];          private function dataFunc(series:Series, item:Object, fieldName:String):Object {              trace("fieldName: " + fieldName);              if(fieldName == "yValue" && series.id=="highClose")                  return(item.close.High);              else if(fieldName == "yValue" && series.id=="lowClose")                  return(item.close.Low);              else if(fieldName == "xValue")                  return(item.month);              else                  return null;              }          private function catFunc(axis:AxisBase, item:Object):Object {              for (var s:String in item) {                  trace(s + ":" + item[s]);              }              return(item.month);          }        </fx:Script>     <s:layout>         <s:VerticalLayout />     </s:layout>     <s:Panel title="ColumnChart">         <s:layout>             <s:VerticalLayout />         </s:layout>         <mx:ColumnChart id="chart" dataProvider="{SMITH}"             showDataTips="true" width="100%" height="100%">             <mx:horizontalAxis>                 <!-- The dataFunction replaces "categoryField='month'. -->                 <mx:CategoryAxis id="h1" dataFunction="catFunc" />             </mx:horizontalAxis>             <mx:series>                 <!--                     The dataFunction replaces yField value, which cannot drill down                     into an object (close.High is not valid).                 -->                 <mx:ColumnSeries id="highClose" displayName="Close (High)"                     dataFunction="dataFunc" />                 <!--                     The dataFunction replaces yField value, which cannot drill down                     into an object (close.Low is not valid).                 -->                 <mx:ColumnSeries id="lowClose" displayName="Close (Low)"                     dataFunction="dataFunc" />             </mx:series>         </mx:ColumnChart>     </s:Panel> </s:Application>