Problem with gtkmm initialization?

["Germán Diago" <germandiago gmail com>]

Hello. I've got some problems with this (simplified) code:

/********************************NORMAL GTKMM
CODE************************************/
struct Columnas : public Gtk::TreeModelColumnRecord {
    Gtk::TreeModelColumn<Glib::ustring> pluginname;
    Gtk::TreeModelColumn<Glib::ustring> pluginversion;

    Columnas()
    {
        add(pluginname);
        add(pluginversion);
    }
};

}



class PluginsView : public Gtk::VBox {
private:
    Gtk::TreeView view_;
    Glib::RefPtr<Gtk::ListStore> liststore_;
    priv::Columnas cols_;

public:
    PluginsView() {}: liststore_(Gtk::ListStore::create(cols_))
    {
        view_.set_model(liststore_);
        view_.append_column("Name", cols_.pluginname);
        view_.append_column("Version", cols_.pluginversion);

        pack_start(view_, false, false);
    }
};

/****************************END NORMAL GTKMM
CODE*********************************7

/*****************************MY
CODE*******************************************************/
class PluginsViewer : public Plugin {
private:
    ...

    //When called, it shows the widget in the application window
    virtual void onAboutPlugins()
    {
        app_.activateWidget("PluginsView");
    }

    //Register widget.
    virtual void init() {
        app_.registerWidget("PluginsView", create<PluginsView>());

    }
};


REGISTER_PLUGIN(PluginsViewer)


This code is compiled as a shared library and loaded later by the
application as a plugin.
create<PluginsView> (which is inside PluginsViewer::init)
is a factory function which returns a boost::shared_ptr<PluginsView>.
The main application inits Gtk
through Gtk::Main m(argc, argv) and then it loads the plugin above.
The problem is that when
PluginsViewer::onAboutPlugins is called, then I get the following
messages (and have no idea why).
Maybe it's shared_ptr's fault? Here are the messages. This one is when
onAboutPlugins is called:

 gtkmm-CRITICAL **: const GType* Gtk::TreeModelColumnRecord::types()
const: assertion `!column_types_.empty()' failed

And these are when I close the application:

glibmm-CRITICAL **: Glib::ObjectBase*
Glib::wrap_create_new_wrapper(GObject*): assertion `wrap_func_table !=
0' failed
glibmm-WARNING **: Failed to wrap object of type 'GdkScreenX11'. Hint:
this error is commonly caused by failing to call a library init()
function.

And sometimes it even crashes. Any clue why this happens? Thanks.