gtk/demos/gtk-demo/stack.ui

<interface>
  <object class="GtkWindow" id="window1">
    <property name="title" translatable="yes">Stack</property>
    <child>
      <object class="GtkGrid">
        <child>
          <object class="GtkStackSwitcher">
            <property name="stack">stack</property>
            <property name="halign">center</property>
          </object>
          <packing>
            <property name="left-attach">0</property>
            <property name="top-attach">0</property>
          </packing>
        </child>
        <child>
          <object class="GtkStack" id="stack">
            <property name="can-focus">1</property>
            <property name="transition-type">crossfade</property>
            <child>
              <object class="GtkStackPage">
                <property name="name">page1</property>
                <property name="title" translatable="yes">Page 1</property>
                <property name="child">
                  <object class="GtkImage">
                    <property name="margin-top">20</property>
                    <property name="margin-bottom">20</property>
                    <property name="icon-name">org.gtk.Demo4</property>
                  </object>
                </property>
              </object>
            </child>
            <child>
              <object class="GtkStackPage">
                <property name="name">page2</property>
                <property name="title" translatable="yes">Page 2</property>
                <property name="child">
                  <object class="GtkCheckButton">
                    <property name="label" translatable="yes">Page 2</property>
                    <property name="can-focus">1</property>
                    <property name="halign">center</property>
                    <property name="valign">center</property>
                  </object>
                </property>
              </object>
            </child>
            <child>
              <object class="GtkStackPage">
                <property name="name">page3</property>
                <property name="icon-name">face-laugh-symbolic</property>
                <property name="child">
                  <object class="GtkSpinner">
                    <property name="halign">center</property>
                    <property name="valign">center</property>
                    <property name="active">1</property>
                  </object>
                </property>
              </object>
            </child>
          </object>
          <packing>
            <property name="left-attach">0</property>
            <property name="top-attach">1</property>
          </packing>
        </child>
      </object>
    </child>
  </object>
</interface>