code: public String getReturnToTypeAsString()
      {
          switch ( _returnToType )
          {
              case RETURN_TO_CURRENT_PAGE:
                  return RETURN_TO_CURRENT_PAGE_STR;
              
              case RETURN_TO_PREVIOUS_PAGE:
                  return RETURN_TO_PREVIOUS_PAGE_STR;
              
              case RETURN_TO_PAGE:
                  return RETURN_TO_PAGE_LEGACY_STR;
                  
              case RETURN_TO_PREVIOUS_ACTION:
                  return RETURN_TO_PREVIOUS_ACTION_STR;
              
              case RETURN_TO_ACTION:
                  return RETURN_TO_ACTION_LEGACY_STR;
          }
          
          return null;
      }
docs: Get the type of return as a String, if this is a <code>return-to</code> type.
  
  @return one of the following values: <code>currentPage</code>, <code>previousPage</code>, <code>page</code>,
  (deprecated), <code>previousAction</code>, <code>action</code> (deprecated), or <code>null</code>
  if this is not a <code>return-to</code> type.
  @see #isReturnToAction
  @see #isReturnToPage