synfigapp::Instance (canvas),
// canvas_tree_store_ (Gtk::TreeStore::create(CanvasTreeModel())),
// canvas_tree_store_ (Gtk::TreeStore::create()),
synfigapp::Instance (canvas),
// canvas_tree_store_ (Gtk::TreeStore::create(CanvasTreeModel())),
// canvas_tree_store_ (Gtk::TreeStore::create()),