SharePoint:ItemPicker

Hello,

I followed this post to see how to show an external list in a picker :

http://social.technet.microsoft.com/Forums/sharepoint/en-US/ae8a7606-5466-472d-acab-b465f1947ed7/showing-external-list-in-picker?forum=sharepointdevelopment

The sample code works fine but when I select an item in the dialog it gives me a BDC ID like :__bg01001300130093009300

instead of a field value (title or else).

Could you give me a way to get a better value for this field ?

Regards,

Dkpoo