flex 30 DataGrid 내용 수정하기

<?xml version="1.0"?>
<!-- DataGrid control example. -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">

<!--XMLList로 DB를 작성해놓는다-->
    <mx:XMLList id="employees">
        <employee>
            <name>Christina Coenraets</name>
            <phone>555-219-2270</phone>
            <email>ccoenraets@fictitious.com</email>
            <active>true</active>
        </employee>
        <employee>
            <name>Joanne Wall</name>
            <phone>555-219-2012</phone>
            <email>jwall@fictitious.com</email>
            <active>true</active>
        </employee>
        <employee>
            <name>Maurice Smith</name>
            <phone>555-219-2012</phone>
            <email>maurice@fictitious.com</email>
            <active>false</active>
        </employee>
        <employee>
            <name>Mary Jones</name>
            <phone>555-219-2000</phone>
            <email>mjones@fictitious.com</email>
            <active>true</active>
        </employee>
    </mx:XMLList>

    <mx:Panel title="DataGrid Control Example" height="100%" width="100%"
        paddingTop="10" paddingLeft="10" paddingRight="10">

        <mx:Label width="100%" color="blue"
            text="Select a row in the DataGrid control."/>

<mx:DataGrid id="dg" width="100%" height="100%" rowCount="5" dataProvider="{employees}" editable="true" itemEditEnd="editEnd(event);"> 
<!--editable:내용 수정이 가능하게 하는 메소드, itemEditEnd:내용 수정이 끝난 뒤 돌아가는 메소드-->

            <mx:columns>
                <mx:DataGridColumn dataField="name" headerText="Name"/>
                <mx:DataGridColumn dataField="phone" headerText="Phone"/>
                <mx:DataGridColumn dataField="email" headerText="Email"/>
            </mx:columns>
        </mx:DataGrid>

        <mx:Form width="100%" height="100%">
            <mx:FormItem label="Name">
                <mx:Label text="{dg.selectedItem.name}"/>
            </mx:FormItem>
            <mx:FormItem label="Email">
                <mx:Label text="{dg.selectedItem.email}"/>
            </mx:FormItem>
            <mx:FormItem label="Phone">
                <mx:Label text="{dg.selectedItem.phone}"/>
            </mx:FormItem>
            <mx:FormItem>
             <mx:TextInput id="ti"/>
            </mx:FormItem>
        </mx:Form>
       
    </mx:Panel>
   
    <mx:Script>
     <![CDATA[
      import mx.controls.TextInput;
      import mx.events.DataGridEvent;
      import mx.controls.Alert;

      public function editEnd(event:DataGridEvent):void{
                       <!--이벤트 선언시 유의할것-->
       var input:TextInput = TextInput(event.currentTarget.itemEditorInstance);

       //event.dataField;
       ti.text = input.text;
      }
     ]]>
    </mx:Script>
</mx:Application>