How to get GotoAndStop to work on all duplicated MCs

I have a simple bit of AS which duplicates MCs via looping through a couple of frames:

_root.tile.duplicateMovieClip("tile"+i,i+1)

What I would like to do is to use a button to move each duplicated MC from frame 1 to frame 2, hence changing the appearance of ALL duplicated MCs.

I have tried a simple action on a button:

on (release) {
tile.gotoAndStop(2);
}

but obviously this only changes one MC - the first one, and none of the duplicated ones.

Please can someone advise about the correct syntax to impact on all duplicated MCs?

Thanks

Jim

on (release) {
for( var i=first_tile_i; i<last_tile_i; i++) _root["tile"+i].gotoAndStop(2);
}

Thanks Wizzz, for the advice.

I have tried that, but unfortunately it doesn't work.

If it's not too cheeky, I have uploaded the file I am working on:

swf: http://jimpix.co.uk/thanks2.swf
fla: http://jimpix.co.uk/thanks2.fla

The green bar at the bottom is the button which has the action on you posted on this thread. The idea was that it would move the duplicated m/cs to frame two, and in doing so change their color from green to black.

Any advice much appreciated!

Thanks

Jim