Thread:Project:Support desk/Navigation menu : how to change the apparence like a TreeView menu ?

Hi Guys,

does anybody know how to add a TreeView menu style in the navigation box ? i would like to add menu and sub-menu on the main left menu (navigation) but i do not know how to do it. I noticed that the current mediawiki do it, adding node and subnode in the left side .. any thoughs ?

thanks in advance

M.