......
          <object class="GtkTreeView" id="ModelTable">
            <property name="visible">True</property>
            <property name="can_focus">True</property>
            <property name="model">ModelListStore</property>
            <child internal-child="selection">
              <object class="GtkTreeSelection" id="treeview-selection1"/>
            </child>
          </object>
......
  <object class="GtkListStore" id="CPUListStore">
    <columns>
      <!-- column-name col_cpu -->
      <column type="gchararray"/>
    </columns>
  </object>
  <object class="GtkListStore" id="ModelListStore">
    <columns>
      <!-- column-name name -->
      <column type="gchararray"/>
      <!-- column-name cpu_name -->
      <column type="gchararray"/>
      <!-- column-name gpu_name -->
      <column type="gchararray"/>
      <!-- column-name mem_sz -->
      <column type="gfloat"/>
      <!-- column-name mem_freq -->
      <column type="gint"/>
      <!-- column-name disk_sz -->
      <column type="gint"/>
      <!-- column-name disk_rot -->
      <column type="gint"/>
      <!-- column-name screen_sz -->
      <column type="gfloat"/>
      <!-- column-name price -->
      <column type="gfloat"/>
    </columns>
  </object>

##</code><code>##

# this is the table
$model_table = $builder->get_object('ModelTable');

# cell renderer
# 0th column of "CPUListStore" is used, as it has only that column.
my $renderer_table_cpu = Gtk2::CellRendererCombo->new;
$renderer_table_cpu->set(model=>$builder->get_object('CPUListStore'));
$renderer_table_cpu->set(text_column=>0);
$renderer_table_cpu->set(has_entry=>TRUE);

# the TreeViewColumn
# it corresponds to the COL_CPU_NAME column of the big table
my $col_cpu = Gtk2::TreeViewColumn->new;
$col_cpu->pack_start($renderer_table_cpu,TRUE);
$col_cpu->add_attribute($renderer_table_cpu,'text',COL_CPU_NAME);