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.Statusbar</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="border-width">12</property>
                <property name="orientation">vertical</property>
                <property name="spacing">6</property>
                <child>
                    <object class="GtkButton">
                        <property name="label" translatable="yes">Exibir menssagem</property>
                        <property name="visible">True</property>
                        <property name="can-focus">True</property>
                        <property name="receives-default">True</property>
                        <signal name="clicked" handler="statusbar_show_msg" swapped="no"/>
                    </object>
                    <packing>
                        <property name="expand">False</property>
                        <property name="fill">True</property>
                        <property name="position">0</property>
                    </packing>
                </child>
                <child>
                    <object class="GtkButton">
                        <property name="label" translatable="yes">Remover mensagem</property>
                        <property name="visible">True</property>
                        <property name="can-focus">True</property>
                        <property name="receives-default">True</property>
                        <signal name="clicked" handler="statusbar_remove_msg" swapped="no"/>
                    </object>
                    <packing>
                        <property name="expand">False</property>
                        <property name="fill">True</property>
                        <property name="position">1</property>
                    </packing>
                </child>
                <child>
                    <object class="GtkStatusbar" id="statusbar">
                        <property name="visible">True</property>
                        <property name="can-focus">False</property>
                        <property name="margin-left">10</property>
                        <property name="margin-right">10</property>
                        <property name="margin-start">10</property>
                        <property name="margin-end">10</property>
                        <property name="margin-top">6</property>
                        <property name="margin-bottom">6</property>
                        <property name="orientation">vertical</property>
                        <property name="spacing">2</property>
                    </object>
                    <packing>
                        <property name="expand">False</property>
                        <property name="fill">True</property>
                        <property name="pack-type">end</property>
                        <property name="position">2</property>
                    </packing>
                </child>
            </object>
        </child>
    </object>
</interface>