13     widgets::{PivotType, Widget},
31     children: RefCell<Vec<Arc<dyn Widget>>>,
32     parent: RefCell<Option<Arc<dyn Widget>>>,
49     pub elements: RefCell<BTreeMap<(usize, usize), Arc<dyn Widget>>>,
53     pub focused_widget: RefCell<Option<Arc<dyn Widget>>>,
100     pub fn add_element<T: Widget>(&self, element: &Arc<T>) -> (usize, usize) {  in add_element()
143     pub fn insert<T: Widget>(&self, column: usize, row: usize, element: &Arc<T>) {  in insert()
242 impl Widget for Grid {
243     fn self_ref(&self) -> Arc<dyn Widget> {  in self_ref()  argument
267     fn parent(&self) -> &RefCell<Option<Arc<dyn Widget>>> {  in parent()  argument
271     fn children(&self) -> &RefCell<Vec<Arc<dyn Widget>>> {  in children()  argument
309     fn focused_widget(&self) -> RefCell<Option<Arc<dyn Widget>>> {  in focused_widget()  argument
313     fn focus(&self, focused_widget: &Arc<dyn Widget>) {  in focus()  argument