"Highlighting gtk_radio_button(s) when using only the TAB-key"

["Dr. Chiarello Davide" <ovichi tin it>]

Hi folk!
Is there a way to "highlight" a gtk_radio_button or a button when it is
selected using only the TAB-key on the keyboard?

By default, when "TABBING" around, you can only see a quick blink on the
button but then you can't understad where the 'focus' is anymore.

Thanks.
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