setTileAt problems

Hi all

I started playing with Lime for my new game/project and thanks to tutorial I have now paralax scroll working. Cool stuff - thanks for this nice lib.

What I want to do is to dynamicly change tiles at certain place on the map. 

what I do is:

   local l1 = map:getTileLayer ("l1")    l1:setTileAt (0,{2,2})    l1:show()

… but I get no results.

Does anyone has any experience with this?

TIA.

BTW: It’s my first post here, and I’m glad I joined this community.