I would just set an Enter-Leave flag on 'point'. The following global flag solves the problem efficiently. If you don't like the idea of a global flag, you can change your code to have just a single binding to <1>. Then in that callback, you can detect whether your pointer is over any items, see if the item is tagged 'point', and do what you need accordingly. Just do all your logic in 1 single callback, detection, creation, and toggling with ......if..elsif....elsif....elsif...else

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

my $inpoint = 0;
my $mw = MainWindow->new();

my $canvas = $mw->Canvas(-width => 300, -height => 300, -closeenough =
+> 5);

$mw->bind($canvas, '<1>', \&add_point);

$canvas->bind('point', '<Enter>', sub{ $inpoint = 1 });
$canvas->bind('point', '<Leave>', sub{ $inpoint = 0 });

$canvas->bind('point', '<1>', \&toggle);

$canvas->pack();
MainLoop();

sub add_point {
   ### adding a point...
   return if $inpoint;
   my ($canvas) = @_;
   my $e = $canvas->XEvent;
   my ($x, $y) = ($e->x, $e->y);
   my $id = $canvas->createOval(
      $x - 10, $y - 10, $x + 10, $y + 10,
      -fill => 'blue',
      -tags => ['point']
   );
   ### new point created: "$id => [$x, $y]"
   return;
} ## end sub add_point

sub toggle {
   ### toggle point...
   my ($canvas) = @_;
   my $item_id = $canvas->find('withtag', 'current')->[0];
   ### item id: $item_id
   my $current_color = $canvas->itemcget($item_id, 'fill');
   my $next_color = $current_color eq 'red' ? 'blue' : 'red';
   $canvas->itemconfigure($item_id, -fill => $next_color);
   Tk->break(); # Try to break, but with little luck...
   return;
} ## end sub toggle
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