Thanks to those who helped me with my last Tk question. Now once again I ask for help. I'm having trouble getting my widgets to change colour:

#!/usr/bin/perl

use warnings;
use strict;
use Tk;

#flashcards for multiplication tables
#Neil H watson
#Tue Jul 15 20:24:47 EDT 2003

#upper time table limit
my $scale;
my $table;
my ($score, $guess, $num1, $num2, $question, $answer);
my ($correct, $count, $percent, $rightwrong);
my $colour = 'purple';

#define main window
my $mw = MainWindow->new;

#create a large readable font
my $font = $mw->fontCreate('font',
    -family => 'courier',
    -size => 28,
    -weight => 'bold');

$mw->title("Times Tables");

#return key prints question without
#calculation the first score
$mw->bind("<KP_Enter>", \&question);

#scale to select upper limit (up to 12)
$mw->Scale(-from => 1,
           -to => 12,
           -variable => \$scale)->pack(-side => 'left');

#guess widget 
$mw->Entry(-width => 3,
           -takefocus => 1,
           -font => $font,
           -textvariable => \$guess)->pack(-side => 'right');

#question widget
$mw->Label(-textvariable => \$question,
           -font => $font)->pack(-side => 'right');

#right/wrong widget
$mw->Label(-textvariable => \$rightwrong,
           -foreground => $colour)->pack(-side=> 'bottom');
    
#score widget
$mw->Label(-textvariable => \$score)->pack(-side => 'bottom');

MainLoop;

#checking
sub check {

    if ($answer == $guess) {
        #count correct answers
        $correct++;
        $rightwrong = 'Correct!';
        $colour = 'green';
    }else{
        $rightwrong = 'Wrong!';
        $colour = 'red';
    }
    #count questions
    $count++;

    #calculate score
    $percent = int($correct/$count*100);
    $score = "$correct correct out of $count\n($percent%)";

    #clear guess
    $guess ="";

    question();
}

sub question {
    #generate question and answer
    $table = $scale;
    $num1 = int(rand($table)+1);
    $num2 = int(rand(12)+1);
    $answer = $num1*$num2;
    $question = "$num1 x $num2 = ";

    #return checks answer and prints
    #new question.  This prevents
    #the first loop from calculating
    #a score
    $mw->bind("<KP_Enter>", \&check);
}
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After each question, whether right or wrong, the colour of the right/wrong widget never changes. Why?

Neil Watson
watson-wilson.ca