Two events when selecting a RadioButton

[lecas malecas <darkiiiiii gmail com>]

Hi,

I have some RadioButton's with a function attached to the
signal_clicked() event.

When I select a RadioButton, I get two events, one for the previous
RadioButton that was active, and then another for the RadioButton that
I actually selected.
If I press the one that is already active, I only get one event.

My question is why does two events are triggered? If I just clicked on
one of them, I should just get one event.

Is there a way around this?