private static Controls BeginControlsHelper(TbHelper helper, IDictionary<string, object> htmlAttributes)
        {
            Controls controls = new Controls(helper.ViewContext);
            controls.WriteTag(htmlAttributes, TagRenderMode.StartTag);

            return controls;
        }
        private static ControlGroup BeginControlGroupHelper(TbHelper helper, IDictionary<string, object> htmlAttributes)
        {
            ControlGroup group = new ControlGroup(helper.ViewContext);

            group.WriteTag(htmlAttributes, TagRenderMode.StartTag);

            return group;
        }
        private static Span SpanHelper(TbHelper helper, int spanWidth, int? offset, IDictionary<string, object> htmlAttributes)
        {
            Span span = new Span(helper.ViewContext, spanWidth, offset);

            span.WriteTag(htmlAttributes, TagRenderMode.StartTag);

            return span;
        }