even though Gtk3 module is still in development . Most the code is working in Gtk3.

i have experienced some issues when the window is resized .. buttons are expanding with it .. and help me with accelerators .... please

use strict;
use warnings;
use Gtk3 '-init';
use Glib qw/TRUE FALSE/;

#Creating Window
my $window = Gtk3::Window->new('toplevel');
$window->set(
    title=>rand(int(100)),
#    default_height=>'300',
#    default_width=>'300',
    resizable=>'TRUE',
    focus_on_map=>'TRUE'
);

#creating a Vbox
my $vbox = Gtk3::Box->new('vertical',3);
$vbox->set(
    visible=>TRUE,
    can_focus=>FALSE,
    double_buffered=>FALSE,
    homogeneous=>TRUE,
    expand=>'false'
);

#creating button

my $button = &button;

my $menubar = &createmenubar;

my $text_view = Gtk3::TextView->new();
$text_view->set(editable=>FALSE,cursor_visible=>FALSE);

my $scroll = Gtk3::ScrolledWindow->new();
$scroll->add($text_view);

#   Vbox
#    |--->Menubar
#    |--->Button
#    |--->TextView

#adding itesm to Vbox
$vbox->pack_start($menubar,FALSE,TRUE,3);
$vbox->pack_start($scroll,TRUE,TRUE,0);
$vbox->pack_start($button,FALSE,FALSE,0);


# Window
#    |--->Vbox

$window->add($vbox);

#adding accelerator group
my $accel_group = Gtk3::AccelGroup->new();
$window->add_accel_group($accel_group);


#signale to destroy the main Gtk
$window->signal_connect(destroy=>\&quit);
$window->show_all;
Gtk3->main;



sub changetitle{
    print $window->get_title(),"\n";
    $window->set(
        title=>rand(int(100)),
        );
    
}

sub createmenubar{
    my $menu_item_file = Gtk3::MenuItem->new_with_label('File');

    my $menu_bar = Gtk3::MenuBar->new();
    $menu_bar->add($menu_item_file);

    my $menu_file = Gtk3::Menu->new();
    my $menu_item_refresh = Gtk3::ImageMenuItem->new_from_stock('gtk-r
+efresh');
    $menu_file->add($menu_item_refresh);
    $menu_item_refresh->signal_connect(activate=>\&changetitle);
    
    my $menu_item_quit = Gtk3::ImageMenuItem->new_from_stock('gtk-quit
+');
    $menu_item_quit->signal_connect(activate=>\&quit);
    
#    $menu_item_quit->add_accelerator('activate',$accel_group,Gtk3::Ac
+celerator->parse('<Control>Q'),'visible');
    $menu_file->add($menu_item_quit);
    
    $menu_item_file->set_submenu($menu_file);
    return $menu_bar;
}

sub button {
    my $button_sub =Gtk3::Button->new_with_label('Click to Change the 
+Title');
    #connecting signale connnect clicked to subroutine
    $button_sub->signal_connect(clicked=>\&changetitle);
    $button_sub->set(
        use_action_appearance=>FALSE,
        visible=>TRUE,
        can_focus=>TRUE,
        receives_default=>TRUE,
        use_action_appearance=>FALSE
    );
    return $button_sub;
}

sub quit {
    Gtk3->main_quit;
}
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#creating a Vbox
my $vbox = Gtk3::Box->new('vertical',3);
$vbox->set(
    visible=>TRUE,
    can_focus=>FALSE,
    double_buffered=>FALSE,
    expand=>'false'
);
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