[gtkmm] Convert Enum to GType

[Bryan Forbes <mxpxfifws yahoo com>]

    Is there a way to take a typedef'd enum and turn it into a GType?  The reason I ask
is I'm deriving a class from Gtk::TreeStore, but my derived TreeModel uses an enum I made
up.  here are the classes:

class DataColumns : public Gtk::TreeModel::ColumnRecord
{
public:
  DataColumns()
  { add(m_col_name); add(m_col_size); add(m_col_uri); add(m_col_entity_type); }

  Gtk::TreeModelColumn<Glib::ustring> m_col_name;
  Gtk::TreeModelColumn<Gnome::Vfs::FileSize> m_col_size;
  Gtk::TreeModelColumn<Glib::ustring> m_col_uri;
  Gtk::TreeModelColumn<cstr_EntityType> m_col_entity_type; // cstr_EntityType is my enum
};

class cstr_TreeStoreDnd : public Gtk::TreeStore
{
protected:
  explicit cstr_TreeStoreDnd(const Gtk::TreeModelColumnRecord& columns);

public:
  static DataColumns m_modelColumns;
  static Glib::RefPtr<cstr_TreeStoreDnd> create();

protected:
  // Overridden virtual functions
  virtual bool row_draggable_vfunc(const Gtk::TreeModel::Path& path);
};

When I run the program with these two classes compiled in, I get this warning:
(process:760): GLib-GObject-CRITICAL **: gtype.c:1871: initialization assertion failed,
use g_type_init() prior to this function

And when I actually use the TreeStore class, I get these warnings:
(process:2315): GLib-GObject-CRITICAL **: gtype.c:1871: initialization assertion failed,
use g_type_init() prior to this function
 
(coaster:2315): Gtk-WARNING **: gtktreestore.c:384: Invalid type (null) passed to
gtk_tree_store_set_column_types

and it segfaults when I try to add things to the treestore.  I figure it's because I'm
using that custom enum value.  I've even tried using
Glib::ObjectBase(typeid(cstr_TreeStoreDnd)) in the constructor, and I still get those
warnings.  Is there any easy way to register that enum as a GType?  Thanks in advance!

-Bryan

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