/*std::for_each(
canvas_interface()->get_canvas()->rbegin(), canvas_interface()->get_canvas()->rend(),
sigc::mem_fun(*this, &studio::LayerGroupTreeStore::on_layer_added)
/*std::for_each(
canvas_interface()->get_canvas()->rbegin(), canvas_interface()->get_canvas()->rend(),
sigc::mem_fun(*this, &studio::LayerGroupTreeStore::on_layer_added)