Need help with ADF ajax menu

Hi ! In first, webtest is a fantastic framework ! 

Well, I'm trying to
test an existing application that use oracle's ADF JSF framework. There are
some ADFRichMenuItem inside. 

I can click on the main menu (this is a 'a'
tag), but not on the subitem, it seems that it's a 'tr' tag with a click
listener on it. I'm not an javascript professional :(. 

When I use
selenium 2, with firefoxdriver, it's ok (the second click have target
"//td[@id='xxxxxx']"). The same xpath with webtest or webdriver with
HtmlUnitDriver does'nt work. 

Is anybody can help me ?  
-- 
Yann
Blazart
Architecte Java
Ippon technologie