There are a few ways to do it, and it usually depends on what widget you are working with. Often some widgets have built-in bindings for Button-1, so you need to use a Button-2 or Button-3 binding. Basically, you just pop a menu at the pointerx, pointery location. There are so many ways to do it, that you need to show what code you are using. As a last resort, you can open a small toplevel window at the pointer location, and load it with whatever you desire.

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

my $mw = MainWindow->new;
$mw->title("Listbox");

# For example purposes, we will use one word for each letter
my @choices = qw/alpha beta charlie delta echo foxtrot golf hotel
india juliet kilo lima motel nancy oscar papa quebec radio sierra
tango uniform victor whiskey xray yankee zulu/;

#Create the text box and insert the list of choices in to it
my $lb = $mw->Scrolled("Listbox", -scrollbars => "osoe",
    -height => 20,
    -selectmode => "multiple")
    ->pack(-side => "left");

$lb->insert("end", sort @choices);

my $m = $lb->Menu(-tearoff => 0,-title=>'None',
  -menuitems =>
    [
     [Button => "Delete",  -command => \&do1],
     [Button => "Rename",  -command => \&do2],
    ]
   );

$lb->bind("<Button-3>" => [ sub {
                              $lb->focus; # focus on listbox widget 
                              my($w, $x, $y) = @_;
                              $m->post($x, $y);
                                 }, Ev('X'), Ev('Y') ] );


$mw->Button(-text => "Exit",
-command => sub{exit; })->pack(-side => "bottom");

$mw->Button(-text=>"View", -command => sub {
                     foreach ($lb->curselection()) {
                        print "$choices[$_]\n";
                }
    })->pack(-side => "bottom");


MainLoop;

# Popup menu actions. 
sub do1{
  my @sels = $lb->curselection();
  print "@sels\n";
  @sels = map $choices[$_],@sels;
  print "action do1->@sels\n";
}


sub do2{
  my @sels = $lb->curselection();
  print "@sels\n";
  @sels = map $choices[$_],@sels;
  print "action do2->@sels\n";
}
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