Add and remove data from object class - json

Question

I'm just learning how to work with Json files and my goals are:
Be able to read a Json file
View the info on a TreeView
Be able to Modify, Add, and remove items
Make again the Json File.
For doing this i've learned about Newtonsoft.Json, that helps a lot. I've almost achieved all my goals except being able to add and remove items from my object.
First of all, I load all the Json content to:
Dim ImportedTeams as Teams()
The code for the class objects are the following:
Public Class Teams
Property drivers As Drivers()
Property raceNumber As String
Property CarModel As String
Property ballastKg As String
Property restrictor As String
End Class
Public Class Drivers
Property firstName As String
Property lastName As String
End Class
I have the ImportedTeams with all data filled, from there I get all I need to fill the Treeview, with diferents levels of nodes, etc. Also, I can modify the info stored in the class, and make the Json again. No problems until this point
My problems starts here, when I want to add a new Team. What I tried is the following:
Dim NewTeam As New Teams
Dim NewDriver as New Drivers
With NewDriver
.firstName = TB_Name.text
.lastName = TB_LastName.text
End With
With NewTeam
.drivers = NewDriver()
.raceNumber = NUD_RaceNumbre.Value.ToString
.CarModel = CBB_Car.index
.ballastKg = TB_Ballast.Text
.restrictor = TB_Restrictor.Text
End With
ImportedTeams.append(NewTeam)
This simply wont work. Don't shows up any error, just nothing happens. Also, I don't know how to remove one Team stored in this object.
I also tried to add only a NewTeam, but same problem.
Thanks for your time mates, any help would be appreciated.

Answer 1

As Alex B. said, the solution is easy as follows:
Public Class Teams
Property drivers As **List(of Drivers)**
Property raceNumber As String
Property CarModel As String
Property ballastKg As String
Property restrictor As String
End Class
Public Class Drivers
Property firstName As String
Property lastName As String
End Class
And:
Dim ImportedTeams as **List(of Teams)**
Thanks!