Very obvious issue !
I have a simple datagrid displaying XML data.
I reorder the rows by clicking one of the column's header.
Selecting the 3rd element may no longer be the 3rd element in the XML data structure binded to the datagrid !
So how can i delete the proper XML element ?
To answer this, correcting this official adobe article (buggy since it contains this exact problem !) would do the trick for me as my real case is absolutly identical.