code: Stack getLegacyStack()
      {
          Stack ret = new Stack();
          
          for ( int i = 0; i < _stack.size(); ++i )
          {
              ret.push( ( ( PushedPageFlow ) _stack.get( i ) ).getPageFlow() );
          }
          
          return ret;
      }
docs: Get a stack of PageFlowControllers, not of PushedPageFlows.