Border around a Tile

[javabean]

Hello everybody,

I'm be using SmartGWT 3.1. I would need a TileGrid whose Tiles were sorrounded by a border.

I have accomplished to get this effect by changing in sky_stiles.css:

.simpleTile {
  border: 1px solid;
}

Now unfortunately the result is that all the TileGrids are affected.

I wasn't able to find an API that could allow me to specify a border tile for the tiles of a particular TileGrid.

All the methods I found operate on the fields of the TileGrid or on the TileGrid as a whole but it seems this simpleTile belongs to the internals and cannot be changed...Am I wrong or there is a way to get that?

Thank you very much for any suggestion
Regards
Fabio