gistfile1.js

Ups.planController = SC.TreeController.create(
    SC.CollectionViewDelegate,
/** @scope Ups.planController.prototype */ {
    content: null,
    treeItemChildrenKey: 'actions',
    treeItemIsGrouped: YES,
    collectionViewShouldBeginDrag: function(view) {
        alert("HELLO!");
        return NO;
    },
    collectionViewShouldDeleteIndexes: function(view, indexes) {
        alert(view);
        alert(indexes);
        return null;
    }
}) ;