void RenderSpannerForVerticalTabs(HtmlTextWriter writer)
{
if(!_useVerticalStripPlacement)
return;
writer.AddAttribute(HtmlTextWriterAttribute.Id, ClientID + "_headerSpannerHeight");
writer.AddStyleAttribute(HtmlTextWriterStyle.Display, "block");
writer.RenderBeginTag(HtmlTextWriterTag.Div);
writer.RenderEndTag();
}