code: func (r *RadioButtons) InputHandler() func(event *tcell.EventKey, setFocus func(p tview.Primitive)) {
  	return r.WrapInputHandler(func(event *tcell.EventKey, setFocus func(p tview.Primitive)) {
  		switch event.Key() {
  		case tcell.KeyUp:
  			r.currentOption--
  			if r.currentOption < 0 {
  				r.currentOption = 0
  			}
  		case tcell.KeyDown:
  			r.currentOption++
  			if r.currentOption >= len(r.options) {
  				r.currentOption = len(r.options) - 1
  			}
  		}
  	})
  }
docs: // InputHandler returns the handler for this primitive.