seg fault creating a column to append to a treeview

[Angelo Dureghello <angelo70 gmail com>]

hi all,

i'm quite new to gtkmm-2.4, i receive a seg fault creating a column to 
append to a treeview. This is the involved code:

on .h:

class WndMain : public Gtk::Window
{
   ....

typedef Glib::RefPtr<Gdk::Pixbuf> refpix;
typedef Glib::RefPtr<Gtk::ListStore> reflst;
class ModelColumns : public Gtk::TreeModelColumnRecord
  {
  public:
     ModelColumns()
     {
           add(m_colState);
           add(m_colIcon);
        add(m_colSignature);
        add(m_colSerial);
     }
       Gtk::TreeModelColumn<int>                m_colState;
       Gtk::TreeModelColumn<refpix>            m_colIcon;
     Gtk::TreeModelColumn<Glib::ustring>    m_colSignature;
     Gtk::TreeModelColumn<Glib::ustring>    m_colSerial;
  };

   reflst                    m_rListStore;
   Gtk::TreeView          *m_ptvConnections;

   const ModelColumns   m_Columns;
   ...
};

on cpp:

   ....

   if (m_ptvConnections)
   {
     m_rListStore = Gtk::ListStore::create(m_Columns);
     m_ptvConnections->set_model(m_rListStore);


     m_ptvConnections->append_column("test", m_Columns.m_colState); <-- 
this give seg fault
   }


Same code is working in another application, where the only difference 
is the main window graphic interface done with glade.
Gdb is telling these informations:

Gtk::Object::Object 
(this=0x2876158,__vtt_parm=0x45891c,construct_params= 0x22fb60)    
object.cc 214
Gtk::Object::Object 
(this=0x2876158,__vtt_parm=0x458918,construct_params= 0x22fb60)    
object.cc 35
_fu1____ZTTN3Gtk14TreeViewColumnE   ()
Gtk::TreeView::append_column<int> (this=0x28759f0, 
title= 0x22fce0,model_column= 0x28757e4))
WndMain::WndMain    (this=0x28759f0,cobject=0x279a0e0,refGlade= 0x22fde0)


If any help, many thanks, Angelo