btn_add->signal_clicked().connect(sigc::mem_fun(*this, &PluginSelector::btn_add_clicked));
btn_remove->signal_clicked().connect(sigc::mem_fun(*this, &PluginSelector::btn_remove_clicked));
added_list.get_selection()->signal_changed().connect (sigc::mem_fun(*this, &PluginSelector::added_list_selection_changed));
btn_add->signal_clicked().connect(sigc::mem_fun(*this, &PluginSelector::btn_add_clicked));
btn_remove->signal_clicked().connect(sigc::mem_fun(*this, &PluginSelector::btn_remove_clicked));
added_list.get_selection()->signal_changed().connect (sigc::mem_fun(*this, &PluginSelector::added_list_selection_changed));