Flex中单选按钮控制表格中的列的增加或减少

1、问题背景

      单选按钮有“苹果”和“香蕉”两个，表格中的列有星期、苹果、香蕉和苹果比率，选择了“苹果”单选按钮，表格显示星期、苹果和苹果比率；选择了“香蕉”单选按钮，表格显示星期和香蕉。

2、问题实例

<?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" 
			   width="100%" height="100%" fontSize="12"
			   fontFamily="微软雅黑"
			   creationComplete="initHandler(event)">
	<s:layout>
		<s:BasicLayout/>
	</s:layout>
	<fx:Style>
		@namespace s "library://ns.adobe.com/flex/spark";
		@namespace mx "library://ns.adobe.com/flex/mx";
		.dataHead{
			color:black;
			background-color:yellow;
		}
	</fx:Style>
	<fx:Script>
		<![CDATA[
			import mx.collections.ArrayCollection;
			import mx.events.FlexEvent;
			import mx.events.ItemClickEvent;

			[Bindable]
			//表格数据绑定
			private var gridArray:ArrayCollection = new ArrayCollection([
				{week:"星期一",apple:"4567",banana:"7656",appleRate:"56.89"},
				{week:"星期二",apple:"3455",banana:"8567",appleRate:"67.45"},
				{week:"星期三",apple:"6735",banana:"3456",appleRate:"34.23"},
				{week:"星期四",apple:"5454",banana:"8756",appleRate:"89.98"},
				{week:"星期五",apple:"9894",banana:"6746",appleRate:"78.34"},
				{week:"星期六",apple:"3444",banana:"8767",appleRate:"46.89"},
				{week:"星期日",apple:"6756",banana:"5675",appleRate:"16.89"}
			]);
			
			/**
			 * 初始化函数
			 */
			protected function initHandler(event:FlexEvent):void
			{
				appleLabel.selected = true;
				
			}

			/**
			 * 查询按钮点击函数
			 */
			protected function search_clickHandler(event:MouseEvent):void
			{
				
			}

			/**
			 * 单选按钮点击函数
			 */
			protected function radiogroup_itemClickHandler(event:ItemClickEvent):void
			{
				if(event.currentTarget.selectedValue=="苹果")
				{
					apple.visible = true;
					banana.visible = false;
					appleRate.visible = true;
				}
				else if(event.currentTarget.selectedValue=="香蕉")
				{
					apple.visible = false;
					banana.visible = true;
					appleRate.visible = false;
				}
			}

		]]>
	</fx:Script>
	
	<fx:Declarations>
		<s:RadioButtonGroup id="radiogroup" itemClick="radiogroup_itemClickHandler(event)"/>
	</fx:Declarations>
	
	<mx:VBox width="100%" height="100%" paddingBottom="10" paddingLeft="10" paddingRight="20"
			 paddingTop="10">
		<mx:HBox width="100%" height="30" verticalAlign="middle" paddingLeft="10" borderStyle="solid"
				 borderVisible="true" borderColor="0x000000">
			<s:Label text="水果种类："/>
			<s:Label width="5"/>
			<s:RadioButton label="苹果" value="苹果" groupName="radiogroup" id="appleLabel"/>
			<s:Label width="15"/>
			<s:RadioButton label="香蕉" value="香蕉" groupName="radiogroup" id="bananaLabel"/>
			<s:Label width="40"/>
			<s:Button id="search" label="查询" click="search_clickHandler(event)"/>
		</mx:HBox>
		<mx:DataGrid width="100%" height="90%" dataProvider="{gridArray}" textAlign="center" headerStyleName="dataHead"
					 headerHeight="30">
			<mx:columns>
				<mx:DataGridColumn headerText="星期" dataField="week"/>
				<mx:DataGridColumn headerText="苹果" dataField="apple" id="apple"/>
				<mx:DataGridColumn headerText="香蕉" dataField="banana" id="banana"/>
				<mx:DataGridColumn headerText="苹果比率" dataField="appleRate" id="appleRate"/>
			</mx:columns>
		</mx:DataGrid>
	</mx:VBox>
	
</s:Application>

3、实例结果

（1）初始化

（2）选择“苹果”

（3）选择“香蕉”