Changing TreeView Cell Renderers

[Bob Caryl <bob fis-cal com>]

Hello all,

I'm trying to use a treeview and I would like to have a boolean field in 
the data to be rendered as a checkbox and be editable.

The code I'm using looks like this:

   class ModelColumns : public Gtk::TreeModel::ColumnRecord       
   {                                                               
   public:
       ModelColumns()
       {     add(m_disp);
           add(m_check);
           add(m_tag);
           add(m_desg);
           add(m_exec);
       }
       Gtk::TreeModelColumn<Glib::ustring> m_disp;                    
// column for menu display text
       Gtk::TreeModelColumn<gboolean> m_check;                        
// column for check button
       Gtk::TreeModelColumn<Glib::ustring> m_tag;                    // 
column for menu xml tag
       Gtk::TreeModelColumn<Glib::ustring> m_desg;                    
// column for menu designator text
       Gtk::TreeModelColumn<Glib::ustring> m_exec;                    
// column for menu action text.
   };

   ModelColumns m_columns;                                            
// columns for Gtk::ListStore object
   Glib::RefPtr<Gtk::TreeStore> list;                                // 
our listore object for the treeview


   list = Gtk::TreeStore::create(m_columns);
   tree->append_column_editable(" SEL ", m_columns.m_check);   
   tree->append_column(" Name ", m_columns.m_disp);   

   Gtk::CellRendererToggle *toggle = new Gtk::CellRendererToggle;
   Gtk::TreeView::Column *pColumn = tree->get_column(0);
   pColumn->clear();
   pColumn->pack_start(*toggle);


The foregoing code does indeed place a checkbox type renderer in the 
column cell, but it does not appropriately display the data, nor is it 
editable.  Oh yeah, that code does not appear inline like that in the 
app.. just wanted to show all the declarations and definitions.

Any ideas on what I'm omitting or doing wrong here?

Thanks,
Bob Caryl