src/vs/workbench/contrib/notebook/browser/view/renderers/cellRenderer.ts/AbstractCellRenderer/createToolbar
class AbstractCellRenderer:	protected createToolbar(container: HTMLElement, elementClass?: string): ToolBar {
		const toolbar = new ToolBar(container, this.contextMenuService, {
			getKeyBinding: action => this.keybindingService.lookupKeybinding(action.id),
			actionViewItemProvider: action => {
				return createActionViewItem(this.instantiationService, action);
			},
			renderDropdownAsChildElement: true
		});

		if (elementClass) {
			toolbar.getElement().classList.add(elementClass);
		}

		return toolbar;
	}