public function OnPreRender()
 {
     $a_items = array('A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z');
     $querystring = QueryStringBuilder::RemoveParameter('az');
     foreach ($a_items as $s_item) {
         if ($s_item == $this->s_current) {
             $o_li = new XhtmlElement('li', new XhtmlElement('strong', $s_item));
             $this->AddControl($o_li);
             unset($o_li);
         } else {
             if (in_array($s_item, $this->disabled, true)) {
                 $this->AddControl(new XhtmlElement('li', $s_item));
             } else {
                 $o_link = new XhtmlElement('a', $s_item);
                 # $o_link->AddAttribute('href', $this->s_page . $querystring . 'az=' . strtolower($s_item));
                 $o_link->AddAttribute('href', $this->s_page . '?az=' . strtolower($s_item));
                 $o_li = new XhtmlElement('li', $o_link);
                 $this->AddControl($o_li);
                 unset($o_link);
                 unset($o_li);
             }
         }
     }
 }
 function SetQueryString($s_input)
 {
     if (is_string($s_input)) {
         $this->s_query_string = QueryStringBuilder::RemoveParameter('page', $s_input);
     }
 }