Answer posted by Dan Letecky [DayPilot] 12 years ago.
It looks like you might be using the Lite (open-source) version of DayPilot (http://www.daypilot.org/daypilot-lite/) with a sample code created for DayPilot Pro.
DayPilot Lite for ASP.NET WebForms doesn't include the DayPilotNavigator and DayPilotMenu controls. See also the availability details in the documentation: