gnome-control-center/panels/user-accounts/cc-avatar-chooser.ui

<?xml version="1.0"?>
<interface>
  <!-- interface-requires gtk+ 3.8 -->
  <template class="CcAvatarChooser" parent="GtkPopover">
    <property name="visible">False</property>
    <child>
      <object class="GtkBox">
        <property name="orientation">GTK_ORIENTATION_VERTICAL</property>
        <property name="spacing">10</property>
        <child>
          <object class="GtkFlowBox" id="user_flowbox">
            <property name="selection-mode">none</property>
            <property name="homogeneous">True</property>
            <property name="max-children-per-line">5</property>
            <property name="column-spacing">10</property>
          </object>
        </child>
        <child>
          <object class="GtkFlowBox" id="flowbox">
            <property name="selection-mode">none</property>
            <property name="homogeneous">True</property>
            <property name="max-children-per-line">5</property>
            <property name="column-spacing">10</property>
          </object>
        </child>
        <child>
          <object class="GtkBox">
            <property name="halign">GTK_ALIGN_CENTER</property>
            <property name="spacing">20</property>
            <child>
              <object class="GtkButton">
                <property name="label" translatable="yes">Select a File…</property>
                <signal name="clicked" handler="cc_avatar_chooser_select_file" swapped="yes"/>
              </object>
            </child>
          </object>
        </child>
      </object>
    </child>
  </template>
</interface>