Ember toggle example

gistfile1.js

App.SidePanelComponent = Em.Component.extend({
    tagName: 'div',
    classNames: ['blah'],
    classNameBindings: ['isOpen:opened:closed'],
    isOpen: false,
    actions: {
      toggleSidepanel: function(){
          this.toggleProperty('isOpen');
      }
    }
});