<A target="_blank" href="http://hermes.intec.co.uk/intec/blog.nsf/dx/12102009133431HERGRN.htm">Paul Withers has posted Part Five in his six-part series</A> on validating radio buttons, check boxes, and list boxes in XPages. He provides code samples and some tweaks for the differences between 8.5 and 8.5.1.