src/vs/workbench/contrib/preferences/browser/settingsWidgets.ts/AbstractListSettingWidget/renderAddButton
class AbstractListSettingWidget:	private renderAddButton(): HTMLElement {
		const rowElement = $('.setting-list-new-row');

		const startAddButton = this._register(new Button(rowElement, defaultButtonStyles));
		startAddButton.label = this.getLocalizedStrings().addButtonLabel;
		startAddButton.element.classList.add('setting-list-addButton');

		this._register(startAddButton.onDidClick(() => {
			this.model.setEditKey('create');
			this.renderList();
		}));

		return rowElement;
	}