datagrid inline itemrender change dataprovider value - actionscript-3

Question

I create a datagrid with inline itemrenderer.
The renderer is a dropdownlist.
When dropdowlist value change, I'd like to update dataprovider but I didn't found how to do that.
Can you help me?
Thanks
[Bindable] private var DP_PRAT_INIT:ArrayCollection;
<s:DataGrid id="dgTuVous" fontWeight="normal"
dataProvider="{DP_PRAT_INIT}"
width="100%" height="100%"
horizontalScrollPolicy="on"
fontSize="10"
>
<s:columns>
<s:ArrayList>
<s:GridColumn dataField="prInitiales" width="40" headerText="Prat" />
<s:GridColumn width="75" dataField="prTuVous"
headerText="Tu/Vous" editable="true">
<s:itemRenderer>
<fx:Component>
<s:GridItemRenderer>
<fx:Script>
<![CDATA[
import spark.events.IndexChangeEvent;
protected function ddlTuVous_changeHandler(event:IndexChangeEvent):void
{
DP_PRAT_INIT[ddlTuVous.selectedIndex].prTuVous=ddlTuVous.selectedItem;
trace ("ddlTuVous.selectedItem" +ddlTuVous.selectedItem) ;
}
]]>
</fx:Script>
<s:DropDownList width="100%" selectedIndex="1" id="ddlTuVous"
change="ddlTuVous_changeHandler(event)">
<s:dataProvider>
<s:ArrayList>
<fx:String>Tu</fx:String>
<fx:String>Vous</fx:String>
</s:ArrayList>
</s:dataProvider>
</s:DropDownList>
</s:GridItemRenderer>
</fx:Component>
</s:itemRenderer>
</s:GridColumn>
</s:ArrayList>
</s:columns>
</s:DataGrid>

Answer 1

You reference the host control with the outerDocument property... so you would call outerDocument.DP_PRAT_INIT if you want to access that array. BUT, that array is private, so you have to make it public. Or, you can make a public function that you can call on outerDocument but ... yuck.
If I am understanding your code properly, you should access the data property of the GridItemRenderer which is the same as outerDocument.DP_PRAT_INIT[ddlTuVous.selectedIndex] except that it is better because you don't have possible index mismatches...
So, what you really want is:
data.prTuVous = ddlTuVous.selectedItem;