Datagrid: how to use AddData

[David Bovill]

Having problems adding data using:

dispatch "*AddData*" to group "DataGrid" with theArray

as specified here:
http://revolution.screenstepslive.com/spaces/revolution_tools/manuals/datagrid/lessons/3461-Data-Grid-API.
I'm getting bad data added, so wandering what mistake I am making -
essentially can;t find any info in the docs regarding the format of
theArray. I've tried the same format as dgData (indexed with indexNum
integers) and also one nested level down ie the contents of something like
dgdata [1] - no joy. Help :)