I've worked out a solution to this problem, however I'm still slightly unsure of whats going on here. Thanks for your help. 
$canvas->g_bind("<MouseWheel>", [ sub { my($D) = @_; print $D . "\n"; 
+}, Tkx::Ev("%D") ]);

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In reply to Re^2: Perl/Tkx Mousewheel by chiron
in thread Perl/Tkx Mousewheel by chiron

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