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 #get the recipe list in the main windows
my $recipe_clist = show_recipe_list();
...

## show everything in the main windows ##
show_all $window_main;

sub refresh_main_window {
        $recipe_clist->hide();
        $recipe_clist = show_recipe_list() || die "Problem on exchange
+: $!";
        $recipe_clist->show_now() || die "Problem on show: $!";
}