flex dataGrid 中的editable有关问题 （急）

flex dataGrid 中的editable问题 （急，急，急）
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
  layout="absolute">
  <mx:Script>
  <![CDATA[
  import mx.controls.Alert;
  import mx.controls.CheckBox;
  import mx.events.FlexEvent;
  import mx.collections.ArrayCollection;
  [Bindable]
  private var dataSource:ArrayCollection=new ArrayCollection([
  {id: '一班',visible:false}, 
  {id: 1, name: "test1", age: 12, selected: true,visible:true}, 
  {id: 2, name: "test2", age: 40, selected: false,visible:true}, 
  {id: 3, name: "test3", age: 20, selected: false,visible:true}, 
  {id: '二班',visible:false}, 
  {id: 4, name: "test4", age: 18, selected: true,visible:true}, 
  {id: 5, name: "test5", age: 60, selected: true,visible:true},]);
   
  public function checkBoxClickHandler(event:Event, record:Object):void 
  {
  var checkBox:CheckBox = event.target as CheckBox;
  if (checkBox != null) {
  record.selected = checkBox.selected;
  }
  }
   
  ]]>
  </mx:Script>

  <mx:DataGrid id="adGrid"
  width="300"
  height="253"
  fontSize="14"
  dataProvider="{dataSource}"
  x="262.5"
  y="203"
  editable="true">
  <mx:columns>
  <mx:DataGridColumn headerText="序号"
  dataField="id"/>
  <mx:DataGridColumn headerText="名称"
  dataField="name" editable="true"/>
  <mx:DataGridColumn headerText="年龄"
  dataField="age" editable="true"/>  

  <mx:DataGridColumn headerText="是否选择"
  dataField="selected"
  textAlign="center"
  editable="false">
  <mx:itemRenderer>
  <mx:Component>
  <mx:HBox verticalAlign="middle" horizontalAlign="center">
  <mx:CheckBox label="是" visible="{data.visible}" 
  selected="{data.selected}" 
  click="outerDocument.checkBoxClickHandler(event, data)"/>
  </mx:HBox>
  </mx:Component>
  </mx:itemRenderer>
  </mx:DataGridColumn>
  </mx:columns>
  </mx:DataGrid>
</mx:Application>


代码如上 ：怎么实现第一行和第五行不可编辑，其他行科技编辑，谢谢.

[解决办法]
监听表格itemEditBeginHandler事件，不满足条件的终止event.stopImmediatePropagation();

这样就达到了不可编辑的效果。

XML code

<?xml version="1.0" encoding="utf-8"?><mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"                layout="absolute">    <mx:Script>        <![CDATA[            import mx.events.DataGridEvent;            import mx.events.AdvancedDataGridEvent;            import mx.controls.Alert;            import mx.controls.CheckBox;            import mx.events.FlexEvent;            import mx.collections.ArrayCollection;            [Bindable]            private var dataSource:ArrayCollection=new ArrayCollection([{id: '一班', visible: false}, {id: 1, name: "test1", age: 12, selected: true, visible: true}, {id: 2, name: "test2", age: 40, selected: false, visible: true}, {id: 3, name: "test3", age: 20, selected: false, visible: true}, {id: '二班', visible: false}, {id: 4, name: "test4", age: 18, selected: true, visible: true}, {id: 5, name: "test5", age: 60, selected: true, visible: true},]);            public function checkBoxClickHandler(event:Event, record:Object):void            {                var checkBox:CheckBox=event.target as CheckBox;                if (checkBox != null)                {                    record.selected=checkBox.selected;                }            }                        private function itemEditBeginHandler(event:DataGridEvent):void            {                var rowIndex:int = event.rowIndex;                var record:Object = dataSource.getItemAt(rowIndex);                                if (record == null || !record.visible) {                    event.stopImmediatePropagation();                }            }        ]]>    </mx:Script>    <mx:DataGrid id="adGrid"                 width="300"                 height="253"                 fontSize="14"                 dataProvider="{dataSource}"                 itemEditBegin="itemEditBeginHandler(event)"                 x="262.5"                 y="203"                 editable="true">        <mx:columns>            <mx:DataGridColumn headerText="序号"                               dataField="id"/>            <mx:DataGridColumn headerText="名称"                               dataField="name"                               editable="true"/>            <mx:DataGridColumn headerText="年龄"                               dataField="age"                               editable="true"/>            <mx:DataGridColumn headerText="是否选择"                               dataField="selected"                               textAlign="center"                               editable="false">                <mx:itemRenderer>                    <mx:Component>                        <mx:HBox verticalAlign="middle"                                 horizontalAlign="center">                            <mx:CheckBox label="是"                                         visible="{data.visible}"                                         selected="{data.selected}"                                         click="outerDocument.checkBoxClickHandler(event, data)"/>                        </mx:HBox>                    </mx:Component>                </mx:itemRenderer>            </mx:DataGridColumn>        </mx:columns>    </mx:DataGrid></mx:Application>