Can change the frame of an image added to an ImageGroup?

Is it possible to change the frame of an image added to an imageGroup?

For example

[lua]local background_sheet = graphics.newImageSheet( “space.png”, options )
background_group = display.newImageGroup( background_sheet )
local tile = display.newImage( background_sheet, 1 )

– is it possible to:
tile:currentFrame = 1[/lua]

frame and currentFrame don’t seem to work. Is the new Sprite API posted somewhere? [import]uid: 98652 topic_id: 27146 reply_id: 327146[/import]