[web2py] How to cause radio buttons to auto deselect?

[dlypka]

When I create several radio buttons in a web2py form, they do not auto
deselect when another is selected. They all stay selected.  Do I need
to add my own javascript code to do the auto deselect (so that only
one radio button at a time stays selected)
or does web2py have some support for this behavior?