public function updateEditForm($form){
		if($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)){
				$form->setFields(FieldList::create(
					LiteralField::create('NotAManager', "You do not have permission to manage $plural on any Sites")
				));
			}
		}
	}