builder.ui

<interface>
  <menu id="appmenu">
    <section>
      <item>
        <attribute name="label" translatable="yes">_Preferences</attribute>
        <attribute name="action">app.preferences</attribute>
      </item>
    </section>
    <section>
      <item>
        <attribute name="label" translatable="yes">_About</attribute>
        <attribute name="action">app.about</attribute>
      </item>
      <item>
        <attribute name="label" translatable="yes">_Quit</attribute>
        <attribute name="action">app.quit</attribute>
      </item>
    </section>
  </menu>
  <object class="GtkApplicationWindow" id="main-window">
    <property name="default-height">600</property>
    <property name="default-width">800</property>
    <signal name="destroy" handler="main-app-close-cb"/>
    <child type="titlebar">
      <object class="GtkHeaderBar" id="header-bar">
        <property name="visible">True</property>
        <property name="show-close-button">True</property>
        <property name="title">Write2Chordpro</property>
        <property name="subtitle">(name of file)</property>
        <child>
          <menu id="mb-menu">
            <section>
              <item>
                <attribute name="label">Show Songs</attribute>
                <attribute name="action">settings.show-songs</attribute>
              </item>
            </section>
          </menu>
          <object class="GtkMenuButton" id="menu-button">
            <property name="use-popover">True</property>
            <property name="menu-model">mb-menu</property>
          </object>
          <packing>
            <property name="pack-type">GTK_PACK_END</property>
          </packing>
        </child>
      </object>
    </child>
    <child>
      <object class="GtkGrid" id="main-grid">
        <property name="visible">True</property>
      </object>
    </child>
  </object>
</interface>