code: @Override
      public String pending(boolean silent) {
          if (modified && !warned) {
              if (silent || !PromptDialog.confirm(TX_PROMPT)) {
                  return "Vital entry in progress.";
              }
          }
          
          return null;
      }
docs: Called when a patient context change has been requested.
  
  @param silent = If true, user interaction is not permitted.