public function SearchForm(){
      $searchText = _t('SearchForm.SEARCH', 'Search this site ...');

      if($this->request && $this->request->getVar('Search')) {
         $searchText = $this->request->getVar('Search');
      }
      
      $fields = new FieldList(
         $textField = TextField::create('Search',$searchText)
      );      
      $validator = new RequiredFields('Search');
      $actions = new FieldList(FormAction::create('doSearch','Go'));
      $form = new ZZSearchForm($this,'SearchForm',$fields,$actions,$validator);
      $form->disableSecurityToken()->setFormMethod('get');
      
      return $form;
   }
public $isSearched = false;
   public static $classesToSearch = array('SiteTree');
   public function doSearch($data, $form, $request) {
      $this->isSearched = true;
      $limit = 10;
      $form->classesToSearch(self::$classesToSearch)->setPageLength($limit);
   
      $tplData = array(
         'PageResults' => $form->getResultsByClass('SiteTree'),
         'Query' => $form->getSearchQuery(),
         'Title' => _t('SearchForm.SearchResults', 'Search Results')
      );
      
      $ar = $this->extend('updateDoSearch',$tplData,$form);
      if(!empty($ar)){$tplData = $ar[0];} // dirty
      return $this->owner->customise($tplData)->renderWith(array('Page_results', 'Page'));
   }
public function isSearched(){
      return $this->isSearched;
   }

Page_Controller::$classesToSearch = array('SiteTree','CatItem'); // set classes to search

public static $searchable_fields = array('Title','Model','Manufacturer'); // searchable fields

public function updateDoSearch($tplData,$form){
      $tplData['CatItemResults'] = $form->getResultsByClass('CatItem')->setPageLength(9); // here u can set any additional data lists for ur templates
      return $tplData;
   }

<div id="PageContainer" class="typography">
   <div id="HeaderContainer">
      <h1>$Title</h1>
   </div>   
   <% if Query %>
      <div class="h2">
         <%t Page.RESULTSQUERY "You searched for &quot;{Query}&quot;" Query=$Query %>
      </div>
   <% end_if %>
   <div class="h3">We have found following Pages</div>
   <% include PageSearch %>   
   <div class="h3">We have found following Items</div>
   <% if CatItemResults %>
   <div id="BasketItems" class="row">
      <ul class="basketItems clearfix">
         <% loop CatItemResults %>
            <% include CatItemTeaser %>
         <% end_loop %>
      </ul>
      <% with CatItemResults %>
         <% include Pagination %>
      <% end_with %>
   </div>
   <% else %>
      <div class="h3"><%t Page.RESULTSNO "Sorry, your search query did not return any results." %></div>
   <% end_if %>
</div>

<% if MoreThanOnePage %>
<div class="pagination pagination-centered">
<ul>
   <li class="<% if not NotFirstPage %>disabled <% end_if %>prev">
      <a href="$PrevLink">&laquo;</a>
   </li>
   <% loop Pages %>
      <li<% if CurrentBool %> class="active"<% end_if %>>
         <% if Link %>
            <a href="$Link">$PageNum</a>
   <% else %>
            <span>...</span>
         <% end_if %>
      </li>
   <% end_loop %>
   <li class="<% if not NotLastPage %>disabled <% end_if %>next">
      <a href="$NextLink">&raquo;</a>
   </li>
</ul>
</div>
<% end_if %>