Ive had the same problem too....pain in the bum.
I ended up doing the 'create object' and snapping it to my object in question then parenting etc etc but to do it for what you want Mega probably is impossible.
cheers bullet
BUT if you find a way make sure you post it.
bullet1968
"A Darkness at Sethanon", a book I aspire to model some of the charcters and scenes