That works in GTK yes, but not in Qt, and if I understand documentation for Qt 4.6 (maemo) correctly, that is not possible, or if it is, then I don't know how, because I can't find any hint about it from anywhere, so the only way is to remove and add them, of course I could use Enable/Disable Tabs as well (the tabs are shown, but cannot be used), but the result with them is exactly same as with add/remove, at startup it will work as it should be, but from settings dialog, not.