Special properties' properties

my $font = $window-> font;
$font-> encoding("iso-8859-1");
$window-> font-> encoding("iso-8859-1");

$window-> font-> set( 
     size => 10, name => 'Helvetica');

$window-> set( 
     size => [ 200,200], font => {
        size => 10, name => 'Helvetica'
     });