tests/teststackedheaders.ui

<interface>
  <object class="GtkWindow" id="window">
    <property name="default-width">600</property>
    <property name="default-height">400</property>
    <property name="icon-name">preferences-desktop-font</property>
    <child type="titlebar">
      <object class="GtkStack" id="header_stack">
        <child>
          <object class="GtkStackPage">
            <property name="name">main</property>
            <property name="child">
              <object class="GtkHeaderBar">
                <child type="start">
                  <object class="GtkButton" id="new_btn">
                    <property name="label">New</property>
                    <property name="valign">center</property>
                  </object>
                </child>
                <child type="title">
                  <object class="GtkStackSwitcher">
                    <property name="stack">page_stack</property>
                  </object>
                </child>
              </object>
            </property>
          </object>
        </child>
        <child>
          <object class="GtkStackPage">
            <property name="name">secondary</property>
            <property name="child">
              <object class="GtkHeaderBar">
                <child type="start">
                  <object class="GtkButton" id="back_btn">
                    <property name="icon-name">go-previous-symbolic</property>
                    <property name="valign">center</property>
                  </object>
                </child>
              </object>
            </property>
          </object>
        </child>
      </object>
    </child>
    <child>
      <object class="GtkStack" id="page_stack">
        <child>
          <object class="GtkStackPage">
            <property name="name">page1</property>
            <property name="title">Page 1</property>
            <property name="child">
              <object class="GtkScrolledWindow">
                <property name="hexpand">1</property>
                <property name="vexpand">1</property>
                <property name="hscrollbar-policy">always</property>
                <property name="vscrollbar-policy">always</property>
                <child>
                  <object class="GtkLabel">
                    <property name="halign">center</property>
                    <property name="valign">center</property>
                    <property name="label">Page 1</property>
                  </object>
                </child>
              </object>
            </property>
          </object>
        </child>
        <child>
          <object class="GtkStackPage">
            <property name="name">page2</property>
            <property name="title">Page 2</property>
            <property name="child">
              <object class="GtkScrolledWindow">
                <property name="hexpand">1</property>
                <property name="vexpand">1</property>
                <property name="hscrollbar-policy">always</property>
                <property name="vscrollbar-policy">always</property>
                <child>
                  <object class="GtkLabel">
                    <property name="halign">center</property>
                    <property name="valign">center</property>
                    <property name="label">Page 2</property>
                  </object>
                </child>
              </object>
            </property>
          </object>
        </child>
        <child>
          <object class="GtkStackPage">
            <property name="name">secondary</property>
            <property name="child">
              <object class="GtkScrolledWindow">
                <property name="hexpand">1</property>
                <property name="vexpand">1</property>
                <property name="hscrollbar-policy">always</property>
                <property name="vscrollbar-policy">always</property>
                <child>
                  <object class="GtkLabel">
                    <property name="halign">center</property>
                    <property name="valign">center</property>
                    <property name="label">Secondary</property>
                  </object>
                </child>
              </object>
            </property>
          </object>
        </child>
      </object>
    </child>
  </object>
</interface>