src/vs/base/browser/ui/toolbar/toolbar.ts/ToggleMenuAction/constructor
class ToggleMenuAction:	constructor(toggleDropdownMenu: () => void, title?: string) {
		title = title || nls.localize('moreActions', "More Actions...");
		super(ToggleMenuAction.ID, title, undefined, true);

		this._menuActions = [];
		this.toggleDropdownMenu = toggleDropdownMenu;
	}