src/vs/workbench/api/browser/mainThreadTreeViews.ts/MainThreadTreeViews/getTreeView
class MainThreadTreeViews:	private getTreeView(treeViewId: string): ITreeView | null {
		const viewDescriptor: ITreeViewDescriptor = <ITreeViewDescriptor>Registry.as<IViewsRegistry>(Extensions.ViewsRegistry).getView(treeViewId);
		return viewDescriptor ? viewDescriptor.treeView : null;
	}