EOEnterpriseObject eo=(EOEnterpriseObject)displayGroup().allObjects().objectAtIndex(0); return eo.editingContext();
return displayGroup().dataSource().editingContext();
    public EOEditingContext editingContext() {        EOEnterpriseObject eo=(EOEnterpriseObject)displayGroup().allObjects().objectAtIndex(0);        return eo.editingContext();    }