[flexcoders] newbie question: dataProvider - dataGrid ArrayCollection

[dj]

I'm trying to populate a simple dataGrid and add two arrays, one for
the id that's not shown and one for the title, which is...  the
non-commented line works with just adding an array, but how do I do
the line that's commented out, so I can ge the id field, thanks,
sorry for the newbie question

var _data_fastest:Object =
RemotingProvider.getInstance().getFeatured();
                        fastestAC = new ArrayCollection(_data_fastest.fastest);
                        //fastestAC = new
ArrayCollection([_data_fastest.fastest,_data_fastest.fastestid]);

Thanks,
Patrick