programmatically remove the selected item

[Вадим]

There are three elements that are grouped.
The customer demanded that, when pressed again, the selection was removed.
Hung on the event items Click and wrote

but the selection does not disappear. How to fix?

if(radiobutton)
    radiobutton.isChecked = false
else
    radiobutton.isChecked = true

[Вадим]

if(radiobutton.isChecked)
radiobutton.isChecked = false
else
radiobutton.isChecked = true