OnTileScript

Hi,

How exactly is the syntax of this function ?
I'm tryng to use it, but i'm having some errors.,

In the t2d reference pdf, it says :

onTileScript (this,tileLayerObject,int tileX / tileY, script$)

but, how is this used ?
This is a CallBack, i can't give values to this parameters....
Is there somewhere a example of this working ?

thanks,
Bruno