Clicking again on activated radio button in radio button group will make all radio buttons inactive.
Which is not the way radio buttons work - they are supposed to represent exactly one choice (sometimes initial state is no choice, but it cannot be restored after user interaction).
Moreover, usage of reactive variables for RadioButtonModel state means there's no way to intercept desactivation and cancel it.
Clicking again on activated radio button in radio button group will make all radio buttons inactive. Which is not the way radio buttons work - they are supposed to represent exactly one choice (sometimes initial state is no choice, but it cannot be restored after user interaction). Moreover, usage of reactive variables for RadioButtonModel state means there's no way to intercept desactivation and cancel it.