You can do this by editing the xml for the radio button. Click on the
radio button and then click on the XML Source tab, you'll be placed in
the source at the code for the radio button.Between the
tags, about halfway down there should be a line that says (not the one inside the tags).
Change "middle" to "top".Once you've got it the way you want it you can
save that button to your object library for re-use.