flex的DataGrid中使用ComboBox来实现

<?xml   version= "1.0 "   encoding= "utf-8 "?>
<mx:Application   xmlns:mx= "http://www.adobe.com/2006/mxml "   layout= "absolute "   fontFamily= "宋体 "   fontSize= "12 "   width= "424 "   height= "396 ">      
        <mx:Script>      
                <![CDATA[      
                        import   mx.controls.*;      
                        import   mx.core.Application;
                        import   mx.controls.dataGridClasses.*;      
                        private   var   DataGrid1:DataGrid    
                        [Bindable]
                        public   var   dataArr2:Array   =   [{id:1,name: "铅笔 ",price:100,count: "第2次 "},      
                                                                                {id:2,name: "毛笔 ",price:50,count: "第2次 "},      
                                                                                {id:3,name: "钢笔",price:333,count: "第3次 "}]  
                        [Bindable]
                        public   var   dataArr:Array   =   new   Array({label: "第1次 ",   data: "1 "},{label: "第2次 ",   data: "2 "},
        {label: "第3次 ",   data: "3 "},   {label: "第4次 ",   data: "4 "});
                        [Bindable]  
        public   var   s:int   =   2;
                ]]>      
        </mx:Script>      
      <mx:Component   id= "myComponent ">          
                <mx:ComboBox   x= "179 "   y= "1 "   width= "67 "   dataProvider= "{Application.application.dataArr} "   selectedIndex= "{Application.application.s} ">
                <mx:Script>
                <![CDATA[
                import   mx.core.Application;
                ]]>
                </mx:Script>
                </mx:ComboBox>
        </mx:Component>      
        <mx:DataGrid   id= "DataGrid2 "   editable= "true "   dataProvider= "{Application.application.dataArr2} "   y= "200 "   x= "10 ">      
                <mx:columns>      
                        <mx:DataGridColumn   headerText= "序号 "   dataField= "id "   editable= "false "/>      
                        <mx:DataGridColumn   headerText= "名称 "   dataField= "name "/>    
                        <mx:DataGridColumn   headerText= "价格 "   dataField= "price "   editorDataField= "value "   editable= "false ">      
                                <mx:itemRenderer>      
                                        <mx:Component>      
                                                <mx:NumericStepper   maximum= "1000 "   minimum= "10 ">      
                                                </mx:NumericStepper>      
                                        </mx:Component>      
                                </mx:itemRenderer>      
                        </mx:DataGridColumn>      
                        <mx:DataGridColumn   headerText= "数量 "   dataField= "count "   editable= "true "   editorDataField= "text "   itemEditor= "{myComponent} "/>      
                </mx:columns>      
        </mx:DataGrid>      
</mx:Application>