getting a model's y coordiante

["midget35"]

Pretty basic stuff - I know in flash it's just 'thisMovieClip.y', but I can't 
for the life of me get it to work with Lingo. I'm trying to do something like:

 if gameWorld.model("car").position.y < 20 then 
 -- do stuff

 ... but no joy. Can anyone help? 

 Many thanks