[RESOLVED] List of Lists?

[mwbell]

I'm trying to make a list of flight plans loaded into my program, with each flight plan having a list of waypoints along the route, along with a few other properties associated with the flight plan. Each waypoint has its own associated properties, i.e. waypoint ID, waypoint type, location, etc.

Here's the declarations:

 Public Class WPinfo
        Public WPType As String
        Public WPID As String
        Public WPName As String
        Public WPAltitude As Integer
    End Class
 Public Class FlightPlan
        Public FileName As String
        Public Waypoints As List(Of WPinfo)
 End Class

    Public FlightPlans As List(Of FlightPlan)

How do I implement the List methods to access the list elements, and add, remove, etc? The way I'm doing it now just gets me an 'Object reference not set to an instance of an object' error during runtime.

Thanks!