gistfile1.js

    hideOrShowDescriptionButton: SC.DisclosureView.design({
        tagName: 'div',
        layout: { right: 80, top: 14, width: 15, height: 15 },
        isVisibleBinding: '*parentView.shouldAllowCollapsingStories',
        didChangeValue: function() {
            this.get('parentView').didHideOrShowDescription();
        }.observes('value')
    }),
    
    didHideOrShowDescription: function() {
        if (this.getPath('hideOrShowDescriptionButton.value')) {
            this.adjust('height', Agilo2.STORY_VIEW_COLLAPSED_HEIGHT);
            this.addClass('collapsed');
        }
        else {
            this.adjust('height', Agilo2.STORY_VIEW_EXPANDED_HEIGHT);
            this.removeClass('collapsed');
        }
    }.observes('*hideOrShowDescriptionButton.value'),