t.js

// The Tag model

  isAssignedToSelectedArticle: function(key, value) {
    // writing ...
    if (value !== undefined) {
      if (value === true) {
        Inventory.editedArticleController.get('tags').pushObject(this);
      }
      else {
        Inventory.editedArticleController.get('tags').popObject(this);
      }
    }

    // reading
    return !!Inventory.editedArticleController.get('tags').findProperty('id', this.get('id'));
  }.property('Inventory.editedArticleController.content')


// the list view:

  tags: SC.ScrollView.design({
    layout: { top: 20, width: 250, bottom: 10, left: 270 },
    contentView: SC.ListView.design({
      layout: { top: 0, right: 0, bottom: 0, left: 0 },
      contentBinding: 'Inventory.editedArticleAvailableTagsController.arrangedObjects',
      selectionBinding: 'Inventory.editedArticleAvailableTagsController.selection',
      contentValueKey: "name",
      contentCheckboxKey: "isAssignedToSelectedArticle"
    })
  })