src/vs/workbench/contrib/callHierarchy/browser/callHierarchyPeek.ts/CallHierarchyTreePeekWidget/_fillHead
class CallHierarchyTreePeekWidget:	protected override _fillHead(container: HTMLElement): void {
		super._fillHead(container, true);

		const menu = this._menuService.createMenu(CallHierarchyTreePeekWidget.TitleMenu, this._contextKeyService);
		const updateToolbar = () => {
			const actions: IAction[] = [];
			createAndFillInActionBarActions(menu, undefined, actions);
			this._actionbarWidget!.clear();
			this._actionbarWidget!.push(actions, { label: false, icon: true });
		};
		this._disposables.add(menu);
		this._disposables.add(menu.onDidChange(updateToolbar));
		updateToolbar();
	}