Try reposting on the Flex forum. This forum is for the LiveCycle Data Services product.
I was under the impression that Flex used LiveCycle as its back end. I've been told to post these kind of questions here by Flex people.
Flex can use LiveCycle Data Services on the backend, but it can work with data from many other types of backends as well. The AdvancedDataGrid is a Flex SDK client-side component that consumes data, but it is not tied in any way to specifically to the LiveCycle Data Services server.
This search URL will give you a links to many Flex forums postings about the AdvancedDataGrid:
http://forums.adobe.com/search.jspa?resultTypes=DOCUMENT&resultTypes=MESSAGE&resultTypes=C OMMUNITY&resultTypes=TASK&resultTypes=PROJECT&resultTypes=SOCIAL_GROUP&resultTypes=COMMENT &peopleEnabled=true&q=AdvancedDataGrid