protected function _loadFieldTypeDefinitions()
 {
     if (empty(self::$_aFieldTypeDefinitions)) {
         self::$_aFieldTypeDefinitions = FetchTweets_AdminPageFramework_FieldTypeRegistration::register(array(), $this->oProp->sClassName, $this->oMsg);
     }
     $this->oProp->aFieldTypeDefinitions = $this->oUtil->addAndApplyFilters($this, array('field_types_admin_page_framework', "field_types_{$this->oProp->sClassName}"), self::$_aFieldTypeDefinitions);
 }