flex button事件响应

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flex button事件响应3

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" creationComplete="init()">
  <mx:Script> 
        <![CDATA[ 
            import mx.controls.Label; 
            import mx.events.CloseEvent; 
            import mx.containers.TitleWindow; 
            import mx.managers.PopUpManager; 
  
            private var titleWindow:TitleWindow; 
  
            public function init():void { 
            	mx.controls.Alert.show("tests");
                var label:Label = new Label(); 
                label.text = "Hello world"; 
  
                titleWindow = new TitleWindow(); 
                titleWindow.title = "Custom title"; 
                titleWindow.showCloseButton = true; 
                titleWindow.width = 240; 
                titleWindow.height = 180; 
                titleWindow.addEventListener(CloseEvent.CLOSE, titleWindow_close); 
                titleWindow.addChild(label); 
  
                PopUpManager.addPopUp(titleWindow, this, true); 
                PopUpManager.centerPopUp(titleWindow); 
            } 
  
            private function titleWindow_close(evt:CloseEvent):void { 
                PopUpManager.removePopUp(titleWindow); 
            } 
        ]]> 
    </mx:Script> 

	<mx:Panel y="46" width="868" height="462" layout="absolute" title="学生教材选订" fontSize="16" fontWeight="bold" horizontalCenter="0" horizontalAlign="right">

		<mx:VBox horizontalAlign="right">
		<mx:DataGrid id="stuinfogrid" textAlign="left" x="23" y="10" height="400" width="700" editable="true" fontSize="13">
		<mx:ArrayCollection>
			<mx:Object coursename="软件工程" teachername="马素霞" bookname="软件工程导学"/>
			<mx:Object coursename="软件工程" teachername="马素霞" bookname="软件工程导学"/>
			<mx:Object coursename="软件工程" teachername="马素霞" bookname="软件工程导学"/>
		</mx:ArrayCollection>
			<mx:columns>
				<mx:DataGridColumn headerText="课程" dataField="coursename"/>
				<mx:DataGridColumn headerText="教师" dataField="teachername"/>
				<mx:DataGridColumn headerText="教材" dataField="bookname" minWidth="200"/>
				<mx:DataGridColumn headerText="教材信息" dataField="bookinfo" textAlign="center" editable="true" width="100">
					<mx:itemRenderer>
                  <mx:Component>
                   <mx:Button width="30" height="10" fontSize="14" click="init()" label="查看">
       </mx:Button>
                  </mx:Component>
                 </mx:itemRenderer>

				</mx:DataGridColumn>
				<mx:DataGridColumn headerText="是否订购" dataField="buybook" textAlign="center" itemRenderer="mx.controls.CheckBox" editorDataField="selected" rendererIsEditor="true" minWidth="100" editable="true"/>
				
			</mx:columns>
		</mx:DataGrid>
				</mx:VBox>
	</mx:Panel>
</mx:Application>

为什么click="init()"不起作用点击button时程序没有反映。