Glade interface file: Dialog 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="GtkDialog" id="dialog1">
    <property name="can_focus">False</property>
    <property name="type_hint">dialog</property>
    <child internal-child="vbox">
      <object class="GtkBox" id="dialog-vbox1">
        <property name="can_focus">False</property>
        <property name="margin_left">5</property>
        <property name="margin_right">5</property>
        <property name="margin_top">5</property>
        <property name="margin_bottom">5</property>
        <property name="orientation">vertical</property>
        <property name="spacing">2</property>
        <child internal-child="action_area">
          <object class="GtkButtonBox" id="dialog-action_area1">
            <property name="can_focus">False</property>
            <property name="layout_style">end</property>
            <child>
              <object class="GtkButton" id="button2">
                <property name="label" translatable="yes">Cancel</property>
                <property name="visible">True</property>
                <property name="can_focus">True</property>
                <property name="receives_default">True</property>
              </object>
              <packing>
                <property name="expand">True</property>
                <property name="fill">True</property>
                <property name="position">0</property>
              </packing>
            </child>
            <child>
              <object class="GtkButton" id="button1">
                <property name="label" translatable="yes">Open</property>
                <property name="visible">True</property>
                <property name="can_focus">True</property>
                <property name="receives_default">True</property>
              </object>
              <packing>
                <property name="expand">True</property>
                <property name="fill">True</property>
                <property name="position">1</property>
              </packing>
            </child>
          </object>
          <packing>
            <property name="expand">False</property>
            <property name="fill">True</property>
            <property name="pack_type">end</property>
            <property name="position">0</property>
          </packing>
        </child>
        <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">15</property>
                <property name="margin_right">15</property>
                <property name="margin_top">15</property>
                <property name="margin_bottom">15</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>
          <packing>
            <property name="expand">True</property>
            <property name="fill">True</property>
            <property name="position">1</property>
          </packing>
        </child>
      </object>
    </child>
  </object>
</interface>