optgroup$mold$=function(b){var c=this.isVisible();c&&b.push("<optgroup",this.domAttrs_(),">");for(var a=this.nextSibling;a&&!a.$instanceof(zul.sel.Optgroup);a=a.nextSibling)a.$instanceof(zul.sel.Option)&&this.isOpen()&&a.isVisible()&&a.redraw(b);c&&b.push("</optgroup>")};
