public function updateSearchForm($form){
		if($this->modelIsMultiSitesAware()) {
			$managedSites = Multisites::inst()->sitesManagedByMember();

			$source = Site::get()->filter('ID', Multisites::inst()->sitesManagedByMember())->map('ID', 'Title')->toArray();
			$plural = singleton($this->owner->modelClass)->plural_name();
			if(count($source)){
				$activeSite = $this->getActiveSite();
				$form->Fields()->push(DropdownField::create(
					'SiteID', 
					"Site: ", 
					$source,
					$activeSite ? $activeSite->ID : null
				));
			}
		}
	}