anchor.diff:    void registerExportButton() {
       if ($('[icon="launch"]') != null) {
         _exportButton = new PaperIconButton.from($('[icon="launch"]'));
  -      _exportButton.onTap.listen((_) {
  +      _exportButton.onClick.listen((_) {
           _exportDialog.toggle();
         });
       }
  
positive.code: 
  import 'dart:async';
  import 'dart:html' hide Document;
  
  import 'package:logging/logging.dart';
  import 'package:route_hierarchical/client.dart';
  
negative.code:   void registerResetButton() {
      if ($('[icon="refresh"]') != null) {
        _resetButton = new PaperIconButton.from($('[icon="refresh"]'));
        _resetButton.onClick.listen((_) {
          _resetDialog.toggle();
        });
      }
  