Put your cursor at the lower right corner to see the cursor I want, then over the "drag handle" to see what I have.

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

my $top = MainWindow->new;

my $text = $top->Scrolled('Text',
    -scrollbars => 'se',
)->pack(
    -expand => 1,
    -fill => 'both'
);

my ($mouse_x, $mouse_y);

my $corner = $text->Subwidget('corner');

my $corner_label = $corner->Label(
    -image => $top->Photo(
        -format=>'gif',
        -data => 'R0lGODlhDAAMALMAAISChNTSzPz+/AAAAOAAyukAwRIA4wAAd8oA
+0MEAe+MTYHcAANAGgnsAAGAA
                  AAAAACH5BAAAAAAALAAAAAAMAAwAAwQfMMg5BaDYXiw178AlcJ6V
+hYFXoSoosm7KvrR8zfXHRQA7'
        ),
)->pack(-side => 'bottom', -anchor => 'se');

# I actually want a resize_nwse cursor, but this was the closest I cou
+ld find
$corner_label->bind('<Enter>' => sub {$corner->configure(-cursor => 's
+izing')});

$corner_label->bind('<1>' => sub {
    ($mouse_x, $mouse_y) = ($top->pointerx, $top->pointery)
 });

$corner_label->bind('<B1-Motion>' => sub {
    my $x = $top->width  - $mouse_x + $top->pointerx;
    my $y = $top->height - $mouse_y + $top->pointery;
    ($mouse_x, $mouse_y) = ($top->pointerx, $top->pointery);
    $top->geometry($x.'x'.$y);
});

MainLoop;
[download]