code: private TwoColors getRootPaneInteriorColors(Which type) {
          switch (type) {
  
          case BACKGROUND_ENABLED_WINDOWFOCUSED:
              return rootPaneActive;
  
          case BACKGROUND_ENABLED:
              return rootPaneInactive;
          }
  
          return null;
      }
docs: DOCUMENT ME!
  
  @param  type DOCUMENT ME!
  
  @return DOCUMENT ME!