use Tk;

$mw = new MainWindow;
$main = $mw -> Scrolled("Canvas",-scrollbars=>'e')-> pack(-side => 'left', -fill => 'both', -expand => 1);
$canvas = $main->Subwidget("canvas");

Tk::bind($canvas, '<MouseWheel>', [ sub {$f->yview('scroll',-($_[1] / 120) * 3,'units')}, Ev('D')]); 

$see = "\nHaaa, See that and die!";
$info = $main->createText(180, 15, -text => "$see", -font => 'Arial 11 bold' , -fill => red);
$main->configure(-scrollregion => [0,0,2000 , 2000]);

$canvas_cube = $main->Canvas(-width => 15, -height => 15, -background => 'green');
$main ->createWindow(75,75, -window => $canvas_cube);

$canvas->focus;

MainLoop;