this is the long way to acheive what you wanna acheive but should do the trick
anyway in your functions.php find
make 2 conditionals around it the first will be if any of the vbcodes you want then check usergroup if ok then do vbcode else make a little javascript pop up to say you are not authorised to use this vbcode
i would help you more but i'm nto on my computer and thus have no access to the code in order to try and wrtie the conditinals for you