diff --git a/MiAZ/frontend/desktop/widgets/mainwindow.py b/MiAZ/frontend/desktop/widgets/mainwindow.py
new file mode 100644
index 00000000..48f1c946
--- /dev/null
+++ b/MiAZ/frontend/desktop/widgets/mainwindow.py
@@ -0,0 +1,121 @@
+#!/usr/bin/python3
+# -*- coding: utf-8 -*-
+
+"""
+# File: mainwindow.py
+# Author: Tomás Vírseda
+# License: GPL v3
+# Description: Setup widget for the main window
+"""
+
+from gi.repository import Gdk, Gio, GLib, Gtk
+
+from MiAZ.backend.log import get_logger
+from MiAZ.frontend.desktop.widgets.statusbar import MiAZStatusbar
+
+
+class MiAZMainWindow(Gtk.Box):
+    def __init__(self, app, edit=True):
+        self.app = app
+        self.backend = self.app.get_service('backend')
+        self.actions = self.app.get_service('actions')
+        self.util = self.app.get_service('util')
+        self.icm = self.app.get_service('icons')
+        self.factory = self.app.get_service('factory')
+        self.repository = self.app.get_service('repository')
+        self.log = get_logger('MiAZ.Selector')
+        super(MiAZMainWindow, self).__init__(orientation=Gtk.Orientation.VERTICAL, hexpand=True, vexpand=True, spacing=0)
+        self.win = self.app.get_widget('window')
+        self._setup_ui()
+        self._setup_event_listener()
+
+    def _setup_ui(self):
+        # Widgets
+        ## HeaderBar
+        headerbar = self.app.add_widget('headerbar', Gtk.HeaderBar())
+        self.win.set_titlebar(headerbar)
+
+        ## Stack & Stack.Switcher
+        stack = self._setup_stack()
+        self.append(stack)
+
+        # Setup system menu
+        self._setup_menu_app()
+
+        # Setup headerbar widgets
+        self._setup_headerbar_left()
+        self._setup_headerbar_center()
+        self._setup_headerbar_right()
+
+        # Statusbar
+        statusbar = self.app.add_widget('statusbar', MiAZStatusbar(self.app))
+        self.append(statusbar)
+
+    def _setup_event_listener(self):
+        evk = Gtk.EventControllerKey.new()
+        self.app.add_widget('window-event-controller', evk)
+        evk.connect("key-pressed", self._on_key_press)
+        self.win.add_controller(evk)
+
+    def _setup_headerbar_left(self):
+        headerbar = self.app.get_widget('headerbar')
+
+        # System menu
+        menubutton = self.app.get_widget('headerbar-button-menu-system')
+        menubutton.set_has_frame(False)
+        menubutton.get_style_context().add_class(class_name='flat')
+        menubutton.set_valign(Gtk.Align.CENTER)
+        headerbar.pack_start(menubutton)
+
+        # Filters and Search box
+        hbox = self.factory.create_box_horizontal(margin=0, spacing=0)
+        hbox.get_style_context().add_class(class_name='linked')
+        self.app.add_widget('headerbar-left-box', hbox)
+        headerbar.pack_start(hbox)
+
+    def _setup_headerbar_right(self):
+        headerbar = self.app.get_widget('headerbar')
+        hbox = self.factory.create_box_horizontal(margin=0, spacing=0)
+        hbox.get_style_context().add_class(class_name='linked')
+        self.app.add_widget('headerbar-right-box', hbox)
+        headerbar.pack_end(hbox)
+
+    def _setup_headerbar_center(self):
+        pass
+
+    def _setup_stack(self):
+        self.stack = self.app.add_widget('stack', Gtk.Stack())
+        self.switcher = self.app.add_widget('switcher', Gtk.StackSwitcher())
+        self.switcher.set_stack(self.stack)
+        self.stack.set_vexpand(True)
+        return self.stack
+
+    def _setup_menu_app(self):
+        menu = self.app.add_widget('window-menu-app', Gio.Menu.new())
+        section_common_in = self.app.add_widget('app-menu-section-common-in', Gio.Menu.new())
+        section_common_out = self.app.add_widget('app-menu-section-common-out', Gio.Menu.new())
+        section_danger = self.app.add_widget('app-menu-section-common-danger', Gio.Menu.new())
+        menu.append_section(None, section_common_in)
+        menu.append_section(None, section_common_out)
+        menu.append_section(None, section_danger)
+        menuitem = self.app.factory.create_menuitem('app-settings', _('Application settings'), self.actions.show_app_settings, None, [])
+        section_common_in.append_item(menuitem)
+        menuitem = self.app.factory.create_menuitem('app-about', _('About'), self.actions.show_app_about, None, [])
+        section_common_out.append_item(menuitem)
+        menuitem = self.app.factory.create_menuitem('app-quit', _('Exit application'), self.actions.exit_app, None, [])
+        section_danger.append_item(menuitem)
+
+        menubutton = Gtk.MenuButton(child=self.app.factory.create_button_content(icon_name='miaz-system-menu'))
+        popover = Gtk.PopoverMenu()
+        popover.set_menu_model(menu)
+        menubutton.set_popover(popover=popover)
+        self.app.add_widget('headerbar-button-menu-system', menubutton)
+
+    def show_workspace(self, *args):
+        self.actions.show_stack_page_by_name('workspace')
+
+    def _on_key_press(self, event, keyval, keycode, state):
+        keyname = Gdk.keyval_name(keyval)
+        self.log.debug(keyname)
+        if keyname == 'Escape':
+            self.actions.show_stack_page_by_name('workspace')