// Connect all signals with Cantus.
  CantusAddListenerSigCFunc addlistener = (CantusAddListenerSigCFunc)
                  cantushash_get_pointer(plugindata, "Cantus:AddListenerSigC");
  g_return_if_fail(addlistener != NULL);
  listenerids.push_back(
    addlistener("Filelist:Read:Start",
              SigC::Slot1(*this, &TagEditor::on_selection_changed_event)));
  listenerids.push_back(
    addlistener("File:Read:Finished",
              SigC::slot(*this, &TagEditor::on_file_read_finished_event)));
  listenerids.push_back(
    addlistener("Filelist:Read:Finished",
              SigC::slot(*this, &TagEditor::on_filelist_read_finished_event)));
  listenerids.push_back(
    addlistener("GUI:PluginWidget:Destroyed",
              SigC::slot(*this, &TagEditor::on_uiwidget_destroyed_event)));
}