Flexdatagrid within combobox issue?

hai friends,
      i am using dynamic datagrid . it include one of the column include a dynamic combobox.
for example
that a dynamic combobox include like
1
10
50
100
200
then i retrive data like this its from db.
sec_rights_level ---> db field name
50   --- > first data
1     ---> second data
100   ---> 3rd data
10
200
i want selected value(50) in first row cmbox then
i want selected value(1) in second row combobox.    i gave like this
<s:combobox dataprovider={outdocument.cb_dynamiccb}   selected item={data.db field name}/>// output is not coming
give solution
thanks in advance
regards,
welcome canv

but id name not display within script.check it .
my code is below:
<fx:script>
<![CDATA[
private
function setSelectedItem():void {
cb_combo.selectedItem = data.db field name;// combobox id is not coming.i am getting error.
<mx:DataGrid
id="dg_curtainmanager" showHeaders="true" creationComplete="" variableRowHeight="true" wordWrap="true" dataProvider="{fileListArray}" rowCount="{fileListArray.length}" width="100%" >
     <mx:DataGridColumn
headerText="Rights Level" width="100" minWidth="75" sortable="true" >
<mx:itemRenderer >
<fx:Component>
<mx:HBox>
<mx:ComboBox id="cb_combo" dataProvider="{outerDocument.first.dataProvider}" labelField="sec_rights_level" creationComplete="setSelectedItem()" />
<mx:Label id="lbl_dfcprightlevel" text="{data.dfcp_sec_rights_level}" color="black" />
</mx:HBox>
</fx:Component>
</mx:itemRenderer>
</mx:DataGridColumn>
</mx:DataGrid>

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import java.util.ResourceBundle;
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import javafx.collections.ObservableList;
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<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.collections.*?>
<?import javafx.scene.*?>
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