code: public Collection<Theme> getOwnedThemes(ThemeFilter filter) {
          filter = (filter != null) ? filter : new ThemeFilter();
  
          filter.owners.clear();
          filter.owners.add(this);
          return getInstance().get().themes(filter);
      }
docs: A collection of Themes owned by this member.
  
  @param filter Limit the themes returned (If null, then all items
  returned).
  @return A collection themes that belong to this member filtered by the
  passed in filter.