You can use the grab() function for the second window.
See the example below:
use strict;
use Tk;
my $mw = MainWindow->new( -height => 385, -width => 575);
$mw->title ("Example");
#---------- Adding Button
my $button = $mw->Button(
-text => "Click me!",
-relief => "raised",
"-command"=>\&Click_me,
);
$button->place( -x => 215, -y => 295, -height => 22, -width => 90);
MainLoop;
sub Click_me {
my $mw2 = $mw->Toplevel( -height => 123, -width => 245);
$mw2->title ("");
$mw2->grab();
}
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