The OnClientNodePopulating client-side event occurs just before child nodes are loaded from a Client DataSource. The event can be canceled.
The event handler receives parameters:
The RadNavigation instance that fired the event.
Event arguments with functions:
get_constructor() retrieves the RadNavigation instance that fired the event.
get_cancel() returns a boolean value indicating whether the call to the Client DataSource was canceled.
set_cancel() - call this function to specify whether the event should be canceled (true) or not (false).
get_owner() retrieves an object that is automatically passed to the Client DataSource.