Hello,
I managed to get the internal borders by working directly on the HTML code (Add Style statement with the needed borders to every <td> in the table). I am not sure why it worked, but it did and I had only 2 tabls so it was an OK effort.
Another thing, if a cell is empty, the borders will not show (at least in the Preview). So, I filled empty cells with a space character to get around the problem.
Saad