I must be really thick, but how do i retrive objects froma collection!

i use the following code 2 add 2 a collection

colUsers.Add myNewUserClass, myNewUserClass.UserName

and then the follwoing 2 retirve

Dim myItem As clsUser

For Each myItem In colUsers
MsgBox myItem.UserName
Next

but the above code retrives the repeats the name of the last class i entered. WHere am i going wrong? plz help!