Bullet shape problem

[Yann Collete]

Hello,

I am currently writing a document using the article class.
I want to change the bullet's shape using the popup dialog 
(layout->document->bullet)
When I select a bullet, it as no effect on the shape of bullets in the document 
when viewing with ghostview or xdvi.
When I Export the document to latex, I can see the following latex code in the 
preamble:

\makeatother
\AtBeginDocument{
  \renewcommand{\labelitemi}{\(\ast\)}
  \renewcommand{\labelitemii}{\(\ast\)}
  \renewcommand{\labelitemiv}{\(\ast\)}
}

But it doesn't have any effect on the shape of bullets.
I am using lyx-1.1.6fix3 with tetex-1.0.?.

Your sincerely, 

YC