anchor.diff:      this.model.on('change:mode', this._toggleMode);
   
       this.$backdrop = $('.backdrop');
  -    this.$modeMenu = $('.mode_menu');
   
       var template = $('#share_dialog-template').html();
   
  
positive.code: 
    show: function() {
      this._setLink();
      this.$modeMenu.find('li').removeClass('selected');
      this.$modeMenu.find('.first').addClass('selected');
  
      this.$el.fadeIn(250);
      this.$backdrop.show();
  
negative.code:         mode = $target.attr('data-embed');
  
      if (mode != this.model.get('mode')) {
        this.$modeMenu = $('.mode_menu');
  
        this.$modeMenu.find('li').removeClass('selected');
        $(e.currentTarget).parent().addClass('selected');
  
        this._setMode(mode);
      }
  