Création d ’un cadre et insertion de widgets dans ce cadre
$cadre = $mw->Frame->pack(-side => 'top',
$cadre->Label(-text => "File : ", -relief => 'raised')->pack(-side => 'left',-anchor => 'w');
$cadre->Entry(-textvariable => \$nom_fic)->pack(-side => 'left', -anchor => 'w', -fill => 'x', -expand => 1);
$cadre->Button(-text => "load", -command => sub {&lire_fic})->pack(-side => 'left', -anchor => 'e');