code: public Packer setAnchorSouthEast(final boolean how) {
          if (how == true) {
              gc.anchor = GridBagConstraints.SOUTHEAST;
          } else {
              gc.anchor &= ~GridBagConstraints.SOUTHEAST;
          }
          setConstraints(comp, gc);
          return this;
      }
docs: Add anchor=SOUTHEAST to the constraints for the current component if how
  == true remove it if false.