[support] Hide certain tabs

Hi all, I'm trying to hide some tabs installed with some modules and to do that I'm using hooks like: hook_menu() hook_menu_alter() and I'm setting the access_callback to false. Some tabs are hidden with hook_menu() other with hook_menu_alter() (why?) and another one doesn't want to go away anyhow :) The tab is been installed with the flag module and it's called Bookmarks. So do you know the best way to hide tabs? Should I use temable functions? Regards, Sal