It's my fault really. I need to add that documentation page.
You need to use Properties View to put a radio button or a checkbox in the selected state. I'll release a new version over the weekend that will make using properties more obvious.
Juan Bta.18 Jan 2009
Thanks a lot Peter, I didn't realize that the property tab "had" properties. Was my fault because I use to work with the screen maximized, so I didn't see the property tab near the console and the Javadoc tabs.