[flexcoders] Combobox in a Datagrid not retaining values

[md_ars]

Hello, 

I have following piece of code from main mxml and below that I have 
component code for Combobox. I am using label function to decode values as 
Yes/No when populating Data Grid from the database. It wipe the value from the 
cell once I click on the combobox and don't select values from it. I used 
prompt in combobox which works to avoid blank but it change the values to 
prompt.

I tried many examples but didn't work for me. Please help. Also I want to use 
Item Renderer instead if Item Editor.

Thanks 
Arshad 


main.mxml 
--------------------- 
[Bindable] private var queryData:ArrayCollection = new ArrayCollection(); 
------ 
------ 
<mx:DataGrid id="dgGrid" width="644" dataProvider="{queryData}" height="270" 
editable="true" > 
------ 
----- 
<mx:DataGridColumn width="175" textAlign="center" 
               headerText="Tax" sortable="false" dataField="tax" 
               labelFunction="taxLabel" 
               editable="true" editorDataField="value" 
itemEditor="yesNoComboBox"> 
</mx:DataGridColumn>  

---------------------------------yesNoComboBox ---------- 
<mx:VBox xmlns:mx="http://www.adobe.com/2006/mxml"; 
implements="mx.controls.listClasses.IDropInListItemRenderer,mx.managers.IFocusManagerComponent">

    <mx:Script>
        <![CDATA[
            import mx.controls.listClasses.ListData;
            import mx.controls.dataGridClasses.DataGridListData;
            import mx.controls.listClasses.BaseListData;
            import mx.controls.dataGridClasses.DataGridItemRenderer
            import mx.events.FlexEvent;
                        
                    private var _listData:DataGridListData;

            [Bindable]
            public var cmbValue:Object;            

          
            override public function get data():Object {
                return super.data;
            }            

            override public function set data(value:Object):void {
               cbo.data=value[_listData.dataField];
               cbo.selectedItem= value[_listData.dataField];
               trace("---->"+cmbValue)
           }
            public function get listData():BaseListData
            {
                return _listData;
            }

            public function set listData(value:BaseListData):void
            {
                _listData = DataGridListData(value);
            }  

        ]]>
    </mx:Script>
    <mx:Binding destination="cmbValue" source="cbo.value"/>
   
    <mx:ComboBox id="cbo" editable="true" width="100%" >
        <mx:dataProvider>
            <mx:String>Yes</mx:String>
            <mx:String>No</mx:String>
        </mx:dataProvider>
    </mx:ComboBox>
</mx:VBox>