Hi there, is there anyone who knows how to put a non-breaking space ( ) into a table using the tinyMCE editor??

I have some empty cell and I want the border of the cell to be visible anyway, I try some ways but can't find the right one.

Thank you,

Oh and by the way, TinyMCE is great, congratulation to all of you 

(Sorry for my bad english, i'm french)