You will also need to create the photo and canvas widgets as part of your dialogbox. ie it should read

my $dialog_about = $main_window->DialogBox(
        -title  => "About $program_title",);

    $image = $dialog_about->Photo
            ( -file => 'aboutIE.bmp', -height => 413, width => 289);
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and a similar declaration for your canvas widget.