9.13. How do I group Radiobuttons together?

Specify the -variable option on each one. Here is an example pulled from the icon.pl demo script:

     $letters = '';
     my $w_frame_left_b3 = $w_frame_left->Radiobutton(
         -bitmap   => "\@$tk_library/demos/images/letters",
         -variable => \$letters,
         -value    => 'full',
     );
     my $w_frame_left_b4 = $w_frame_left->Radiobutton(
         -bitmap   => "\@$tk_library/demos/images/noletters",
         -variable => \$letters,
         -value    => 'empty',
     );

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