Can't create child resources from AbstractRecordEditActivity anymore

The problem is that

a) there is no callback telling us the user cancelled or saved (see ROO-1225)
b) If we have child resources, we have no way of getting back the id that was just created so that we can assign the owner to the child resources

see

http://code.google.com/p/google-web-toolkit/issues/detail?id=5160