WYSIWYG

Hi everyone,
got the following problem with the WYSIWYG editor

I changed the tiny config like this

$valid_elements = ‘p/-div[*],-strong/-b[*],-em/-i[*],-font[*],-ul[*],-ol[*],-li[*],tr[*],td[*],table[*],*[*]’;

When I add an alt class to tr’s in a table and save the post everything works fine. When I edit the page again these rows are removed from the visible and code view.

It must be a WordPress filter that removes that stuff, anyone got a clue which filter that is?

thx in advance