Hi Brian, MoI's regular UI doesn't happen to use a radio button anywhere so there isn't a predefined control for it.

The reason it's not been used is that it tends to take up a lot of space. What is used instead is a drop-down control which also allows for one active option showing out of a set.

The drop-down is a <select> control, and yes the Build option in LineWeb.htm is one example.

But it is certainly possible to cook up a radio button using some HTML and script, let me know if you want me to make an example for that.

- Michael