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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