Constructing GtkComboBoxEntry with GtkBuilder

Hello everyone.

I noticed that constructing GtkComboBoxEntry from GtkBuilder's UI file
fails miserably. At construction time, my sample application reports
two errors:

(combo.exe:3388): Gtk-CRITICAL **: gtk_tree_model_get_n_columns:
assertion `GTK_IS_TREE_MODEL (tree_model)' failed

(combo.exe:3388): Gtk-CRITICAL **:
gtk_combo_box_entry_set_text_column: assertion `text_column <
gtk_tree_model_get_n_columns (gtk_combo_box_get_model (GTK_COMBO_BOX
(entry_box)))' failed

And when I try to select something, pop-up is blank (the size is
right, but there is no text) and selection a row produces following

(combo.exe:3388): Gtk-CRITICAL **: gtk_entry_set_text: assertion 'text
!= NULL' failed

I tested this on Windows XP and linux with gtk-2.16.1 installed, UI
file has been produced by glade3-3.6.4. Should I report a bug about
this or am I missing something here? If this is a bug, under which
component do I report it - gtk, GtkBuilder, Glade?

Thanks in advance.

---------- combo.c ----------
#include <gtk/gtk.h>

#define GET_WIDGET( builder, name ) \
	GTK_WIDGET( gtk_builder_get_object( builder, name ) )

main( int    argc,
	  char **argv )
	GtkBuilder *builder;
	GtkWidget  *window;
	GError     *error = NULL;

	gtk_init( &argc, &argv );

	builder = gtk_builder_new();
	if( ! gtk_builder_add_from_file( builder, "combo.builder", &error ) )
		g_print( "Error: %s\n", error->message );
		g_error_free( error );
		return( 1 );

	window = GET_WIDGET( builder, "window1" );

	gtk_builder_connect_signals( builder, NULL );
	g_object_unref( G_OBJECT( builder ) );

	gtk_widget_show_all( window );


	return( 0 );
---------- combo.c ----------

---------- combo.builder ----------
<?xml version="1.0"?>
  <requires lib="gtk+" version="2.16"/>
  <!-- interface-naming-policy project-wide -->
  <object class="GtkListStore" id="liststore1">
      <!-- column-name string -->
      <column type="gchararray"/>
        <col id="0" translatable="yes">Line 1</col>
        <col id="0" translatable="yes">Line 2</col>
  <object class="GtkWindow" id="window1">
    <property name="border_width">6</property>
    <signal name="destroy" handler="gtk_main_quit"/>
      <object class="GtkComboBoxEntry" id="comboboxentry1">
        <property name="visible">True</property>
        <property name="model">liststore1</property>
        <property name="text_column">0</property>
---------- combo.builder ----------

Tadej Borovšak
tadeboro gmail com
tadej borovsak gmail com

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