Glade interface file: Window with notebook with filechooser widget

gistfile1.xml

<?xml version="1.0" encoding="UTF-8"?>
<!-- Generated with glade 3.18.3 -->
<interface>
  <requires lib="gtk+" version="3.12"/>
  <object class="GtkWindow" id="window1">
    <property name="can_focus">False</property>
    <child>
      <object class="GtkNotebook" id="notebook1">
        <property name="visible">True</property>
        <property name="can_focus">True</property>
        <child>
          <object class="GtkFileChooserWidget" id="filechooserwidget1">
            <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_top">10</property>
            <property name="margin_bottom">10</property>
          </object>
        </child>
        <child type="tab">
          <object class="GtkLabel" id="label1">
            <property name="visible">True</property>
            <property name="can_focus">False</property>
            <property name="label" translatable="yes">page 1</property>
          </object>
          <packing>
            <property name="tab_fill">False</property>
          </packing>
        </child>
        <child>
          <placeholder/>
        </child>
        <child type="tab">
          <object class="GtkLabel" id="label2">
            <property name="visible">True</property>
            <property name="can_focus">False</property>
            <property name="label" translatable="yes">page 2</property>
          </object>
          <packing>
            <property name="position">1</property>
            <property name="tab_fill">False</property>
          </packing>
        </child>
        <child>
          <placeholder/>
        </child>
        <child type="tab">
          <object class="GtkLabel" id="label3">
            <property name="visible">True</property>
            <property name="can_focus">False</property>
            <property name="label" translatable="yes">page 3</property>
          </object>
          <packing>
            <property name="position">2</property>
            <property name="tab_fill">False</property>
          </packing>
        </child>
      </object>
    </child>
  </object>
</interface>