src/vs/workbench/contrib/preferences/browser/settingsTree.ts/SettingObjectRenderer/renderTemplate
class SettingObjectRenderer:	renderTemplate(container: HTMLElement): ISettingObjectItemTemplate {
		const common = this.renderCommonTemplate(null, container, 'list');
		const widget = this._instantiationService.createInstance(ObjectSettingDropdownWidget, common.controlElement);
		return this.renderTemplateWithWidget(common, widget);
	}