Heres another double click demo:

#!/usr/bin/perl
use strict;
use Tk;

my ( $clickedon, $released, $double );

my $mw = tkinit;

my $lb = $mw->Scrolled( 'Listbox', -scrollbars => 'osoe' )->pack;
$lb->insert( 0, 'A' .. 'Z' );
$lb->bind( '<ButtonPress-1>',
    sub { $clickedon = $lb->get( $lb->curselection ); } );
$lb->bind( '<ButtonRelease-1>',
    sub { $released = $lb->get( $lb->curselection ); } );
$lb->bind( '<Double-1>', sub { $double = $lb->get( $lb->curselection )
+; } );

my $f1 = $mw->Frame->pack( -anchor => 'w' );
$f1->Label( -text         => 'Clicked on: ' )->pack( -side => 'left' )
+;
$f1->Label( -textvariable => \$clickedon )->pack( -side    => 'left' )
+;
my $f2 = $mw->Frame->pack( -anchor => 'w' );
$f2->Label( -text         => 'Released on: ' )->pack( -side => 'left' 
+);
$f2->Label( -textvariable => \$released )->pack( -side      => 'left' 
+);
my $f3 = $mw->Frame->pack( -anchor => 'w' );
$f3->Label( -text         => 'Double Clicked: ' )->pack( -side => 'lef
+t' );
$f3->Label( -textvariable => \$double )->pack( -side           => 'lef
+t' );

MainLoop;
[download]

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