Sometimes this happens when one of your buttons is not totally inside the
frame (not just the button itself but the whole "box" including the label
that highlights when you select the button in design mode).

"Anna" wrote:

Hi, I've created a group box and put 3 radio buttons inside it - I want to
only be able to select one of the three radio buttons but at the moment I am
able to select 2 at a time - how can I get around this?
Thanks :-)