This example shows how you can use the TreeView control to display hierarchical data from OData sources.
The sample starts by loading the Northwind employees table. When the data is loaded, the code adds an "Orders" empty array to each employee. The lazyLoadFunction is used to load the orders when an employee node is expanded.
The orders table also adds an "Order_Details" empty array to each order. The lazyLoadFunction is used to load the order details when an order node is expanded.