protected override void WriteListPrefix(HtmlTextWriter output)
{
string sCSS = (this.CSSULClassTop + " " + this.CssClass).Trim();
if (!String.IsNullOrEmpty(sCSS)) {
output.WriteLine("<ul id=\"" + this.HtmlClientID + "\" class=\"" + sCSS + "\">");
} else {
output.WriteLine("<ul id=\"" + this.HtmlClientID + "\" >");
}
}