public ZurbPanel(HtmlHelper html, Columns columnWidth, string cssClass = null)
{
_html = html;
var panel = new TagBuilder("div");
panel.AddCssClass("panel");
panel.AddCssClass(String.Format("{0} columns", columnWidth.GetStringValue()));
if (cssClass != null)
panel.AddCssClass(cssClass);
_html.ViewContext.Writer.Write(panel.ToString(TagRenderMode.StartTag));
}