code: public List<Class<Object>> getItemsByScope(final Class<?> scope) {
          return context.getItems(Filters.enabled().and(Filters.registeredBy(scope)));
      }
docs: NOTE: single item may be registered from multiple scopes! This method will return entity by all it's registered
  scopes and not just but by first registration. It makes it usable, for example, for configuration tree building.
  If you need exact registration scope use {@link Filters#registrationScope(Class)} filter.
  
  @param scope required scope
  @return all enabled items registered in specified scope or empty list
  @see ItemInfo#getRegisteredBy() for more info about scopes
  @see ConfigScope for the list of all special scopes