Thank, Anonymous Monk :) I finally figured it out. I actually had the notify=>1 option in my original script but it didn't work like expected (didn't change the background color of the label) so I removed it afterwards, thinking it was useless. Now I have the notify=>1 option and after several failed experiments, I now realize I have to add the -text => '' option in my script to make things really work.

Well, it's kind of weird that in order to change the background color of a label I have to add the quite irrelevant -text => '' option. But it does the trick

Here's the code that works for me. Please note the -text => '' option in the Change() function.:

use Win32::GUI();

use constant {
        TME_HOVER     => 1,
        TME_LEAVE     => 2,
        HOVER_DEFAULT => 0xFFFFFFFF,
        }; 
$state = 0;

$mw = Win32::GUI::Window->new(
        -title => 'Test',
        -pos => [170,100],
        -size => [200,220],
        
);

$label = $mw->AddLabel(
-background => [0,0,255], 
-pos => [ 70, 60 ],
-size => [50, 50 ],
-notify=>1,
-onMouseOver => sub {
$label->Change(-background => [255,0,0],-text=>'', ); 
return 0;
},
-onMouseOut  => sub {
$label->Change(-background => [0,0,255],-text=>'', ); 
$state=0; 
return 0;},
-onMouseMove => \&Move,
);

$mw->Show();
Win32::GUI::Dialog();

sub Move
{
        return unless $state == 0;
        $state = 1;
        $label->TrackMouse(100,TME_HOVER|TME_LEAVE);
        return 1;
}
[download]

And also thanks for the use constant suggestion :)

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