UV Pack margin? [2.63]

Hey, where do i find these features in version 2.63? (see pic)

especially the “pack margin” settings. I know i get the option to change margins if i, for example pick “smart unwrap”. But how do i change my margins for “pack island” and regular “unwrap”?

It should show up in the operator panel after you use it. Just hit Ctrl+P then check the little box pointed out below.

Ahh, Thanks.