MainWindow.glade (Código)

<?xml version="1.0" encoding="UTF-8"?>
<!-- Generated with glade 3.38.2 -->
<interface>
    <requires lib="gtk+" version="3.24"/>
    <object class="GtkApplicationWindow" id="MainWindow">
        <property name="can-focus">False</property>
        <property name="title" translatable="yes">Gtk.MenuBar</property>
        <property name="default-width">683</property>
        <property name="default-height">384</property>
        <property name="icon">../../../assets/icons/icon.png</property>
        <child>
            <object class="GtkBox">
                <property name="visible">True</property>
                <property name="can-focus">False</property>
                <property name="orientation">vertical</property>
                <child>
                    <object class="GtkMenuBar">
                        <property name="visible">True</property>
                        <property name="can-focus">False</property>
                        <child>
                            <object class="GtkMenuItem">
                                <property name="visible">True</property>
                                <property name="can-focus">False</property>
                                <property name="label" translatable="yes">_Arquivo</property>
                                <property name="use-underline">True</property>
                                <child type="submenu">
                                    <object class="GtkMenu">
                                        <property name="visible">True</property>
                                        <property name="can-focus">False</property>
                                        <child>
                                            <object class="GtkMenuItem">
                                                <property name="visible">True</property>
                                                <property name="can-focus">False</property>
                                                <property name="label" translatable="yes">Novo</property>
                                                <property name="use-underline">True</property>
                                                <signal name="activate" handler="on_menu_item_clicked" swapped="no"/>
                                            </object>
                                        </child>
                                    </object>
                                </child>
                            </object>
                        </child>
                        <child>
                            <object class="GtkMenuItem">
                                <property name="visible">True</property>
                                <property name="can-focus">False</property>
                                <property name="label" translatable="yes">Ajuda</property>
                                <property name="use-underline">True</property>
                                <child type="submenu">
                                    <object class="GtkMenu">
                                        <property name="visible">True</property>
                                        <property name="can-focus">False</property>
                                        <child>
                                            <object class="GtkMenuItem">
                                                <property name="visible">True</property>
                                                <property name="can-focus">False</property>
                                                <property name="label" translatable="yes">Sobre</property>
                                                <property name="use-underline">True</property>
                                                <signal name="activate" handler="about" swapped="no"/>
                                            </object>
                                        </child>
                                    </object>
                                </child>
                            </object>
                        </child>
                    </object>
                    <packing>
                        <property name="expand">False</property>
                        <property name="fill">True</property>
                        <property name="position">0</property>
                    </packing>
                </child>
                <child>
                    <placeholder/>
                </child>
            </object>
        </child>
    </object>
</interface>