Accessing nested child in model to populate datafield in datagrid.

Question

I am using Rails + Flex and I have problems to access nested
xml in a datagrid.datafield.
I reproduce this in a simple mxml sample:
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="
http://www.adobe.com/2006/mxml"
layout="absolute" width="954">
<mx:Model id="md">
<root>
<e1>el1</e1>
<e2>el2</e2>
<child>
<c1>c1</c1>
<c2>c2</c2>
</child>
<e3>el3</e3>
</root>
</mx:Model>
<mx:DataGrid id="myGrid"
dataProvider="{md}" >
<mx:columns>
<mx:DataGridColumn dataField="e1"/>
<mx:DataGridColumn dataField="e2"/>
<mx:DataGridColumn dataField="child"/>
<mx:DataGridColumn dataField="child.c1"/>
<mx:DataGridColumn dataField="e3"/>
</mx:columns>
</mx:DataGrid>
</mx:Application>
Basically, at runtime the content of 3rd column is object
(alright) and the 4th column is empty whereas it should be "c1".
Am I doing something obviously wrong ?
Thanks for any help.
Romain.

Answer 1

http://www.adobe.com/devnet/flex/articles/e4x_03.html
http://www.adobe.com/devnet/flex/articles/e4x_04.html
you can use the labelfunction