Ember.LinkView.reopen({
    active: Ember.computed('resolvedParams', 'routeArgs', function () {
        var isActive = this._super();

        Ember.set(this, 'alternateActive', isActive);

        return isActive;
    })
});

@@ -208,16 +208,147 @@
 Active;%0A
+    %7D),%0A%0A    activeClass: Ember.computed('tagName', function () %7B%0A        return this.get('tagName') === 'button' ? '' : 'active';%0A
     %7D)%0A%7D

Remove active class from buttons.