note
emilbarton
This is the problem actually, my $canvas turned to a Tk::Frame in the process. In the simpler script with the same lines of code, even with <br><br><code> $canvas = $Matrix->windowCget("$tracknumber,1" , '-window')</code><br><br>it remains a Canvas object. <br><br><code> bless $canvas, "Tk::Canvas"</code><br><br> doesn't help.
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