gistfile1.js

// controller

	coursesDidChange: function(){
		console.log('coursesArray');		
		var courseItems = this.CourseItem.create({
			// treeItemChildren: groups,
			treeItemIsGrouped: NO
		});

		this.set('content', courseItems);
	}.observes('coursesArray'),

// main.js
	var courses = DarkHorse.store.find(DarkHorse.Course);
	DarkHorse.coursesController.set('coursesArray', courses);