There does not seem to be an obvious way of doing this. How will I go about solving the problem?

Seems to me a menu does that already :) anyway 

my $index = $lb->nearest( $y) ;
$lb->activate( $index );

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In reply to Re: Tkx g_bind to menu on listbox only for selected row by Anonymous Monk
in thread Tkx g_bind to menu on listbox only for selected row by v4169sgr

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