[gtkmm] and now how to put a button in a treeview ?

[cedric <cedric probesys com>]

sorry for the spam !
I'd like to put a button in a treeview.
For example ...

   class ModelColumns : public Gtk::TreeModel::ColumnRecord
   {
   public:

   ModelColumns()
   { add(m_col_text); add(m_col_number); }

   Gtk::TreeModelColumn<Glib::ustring> m_col_text;
   * Gtk::TreeModelColumn<Gtk::Button> mybutton;*
   };


I tried that but i can't use a Gtk::Button in the TreeModelColumn.
The compiler says that Gtk::Button is private ?!?
I also tried to put a pointer : * Gtk::TreeModelColumn<Gtk::Button * > 
mybutton;
*It compiled but the button wasn't displayed.
I don't understand cause i didn't forget to add this column to the view.

Have u any idea ?